Updating the Atomic Theory
|
|
- Basil Owens
- 6 years ago
- Views:
Transcription
1 Updating the Atomic Theory
2 On the basis of Dalton s Atomic Theory: An atom is the basic unit of an element that can enter into chemical combination.
3 Three major differences between modern atomic theory and Dalton s atomic theory 1. Atoms are NOT indivisible. They are made up of smaller particles: electrons, protons and neutrons. 2. Atoms CAN be changed from one element to another, but NOT by chemical reactions. 3. Atoms of the same element are NOT exactly alike. They can have different masses.
4 Interactions Between Electric Charges
5 + positive and negative charges - objects with an equal amount of positive and negative charge are said to be electrically neutral
6 Forces between charges Electrostatic Force - objects with like charge repel + +
7 Forces between charges Electrostatic Force - objects with like charge repel objects with opposite charge attract +
8 Forces between charges Electrostatic Force - objects with like charge repel objects with opposite charge attract +
9 Forces between charges (cont ) - electrostatic force becomes greater the more excess charge - electrostatic force becomes smaller the greater the distance separating the charges
10 Searching for Atomic Structure
11 The Electron The charge-to-mass ratio of an electron was determined by physicist J.J. Thomson in a series of experiments done between 1908 and charge-to-mass ratio = 1.76 x 10 8 coulomb/g
12 The Electron Streams of negatively charged particles were found to emanate from cathode tubes, causing fluorescence. J. J. Thomson is credited with their discovery (1897) Pearson Education, Inc. Atoms, Molecules, and Ions
13 The Electron Thomson measured the charge/mass ratio of the electron to be coulombs/gram (C/g) Pearson Education, Inc. Atoms, Molecules, and Ions
14 Cathode Ray Tube - cathode + anode High voltage When high voltage is applied to the electrodes a glow was noticed between them.
15 Cathode Ray Tube - cathode + anode High voltage When an object was placed in the path of the glow, it blocked part of the beam showing that the beam originated at the negative electrode.
16 Cathode Ray Tube - cathode Negative Electric Field + anode High voltage The fact that the rays were repelled by the negative electric field indicated that they had a negative charge with an e/m ratio of x 10 8
17 J.J. Thomson s plum pudding model
18 The Atom, circa 1900 The prevailing theory was that of the plum pudding model, put forward by Thomson. It featured a positive sphere of matter with negative electrons imbedded in it Pearson Education, Inc. Atoms, Molecules, and Ions
19 The Electron R.A. Millikan measured the charge of an electron to be 1.60 x coulomb Since the charge-to-mass ratio is 1.76 x 10 8 coulomb/g, the mass of an electron must be 9.11 x kg.
20 telescope X-ray source Oil droplets settle into a beam of X rays causing them to become charged with electrons.
21 Positively charged plate + telescope X-ray source Negatively charged plate - A positive plate attracts the negative oil droplets the negative plate repels them making the droplets stand still
22 Positively charged plate + telescope X-ray source Negatively charged plate Knowing the density of the oil, Millikan could calculate the mass, m, of each oil droplet (volume x density = mass ) the force of gravitational attraction was Force = m G the force of electrical force was Force = E e E is the applied voltage, e is the charge of the electron - m droplet G = E e e = -1.6 x coulomb
23 Millikan Oil-Drop Experiment Once the charge/mass ratio of the electron was known, determination of either the charge or the mass of an electron would yield the other Pearson Education, Inc. Atoms, Molecules, and Ions
24 Millikan Oil-Drop Experiment Robert Millikan (University of Chicago) determined the charge on the electron in Pearson Education, Inc. Atoms, Molecules, and Ions
25 Radioactivity Radioactivity is the spontaneous emission of radiation by an atom. It was first observed by Henri Becquerel. Marie and Pierre Curie also studied it Pearson Education, Inc. Atoms, Molecules, and Ions
26 Radioactivity Three types of radiation were discovered by Ernest Rutherford: α particles β particles γ rays 2012 Pearson Education, Inc. Atoms, Molecules, and Ions
27 The Nucleus Ernest Rutherford (gold foil experiment) deduced the nuclear model of the atom, with an extremely small, dense and positively charged nucleus surrounded by empty space sparsely occupied by electrons.
28 Discovery of the Nucleus Ernest Rutherford shot α particles at a thin sheet of gold foil and observed the pattern of scatter of the particles Pearson Education, Inc. Atoms, Molecules, and Ions
29 The Nuclear Atom Since some particles were deflected at large angles, Thomson s model could not be correct Pearson Education, Inc. Atoms, Molecules, and Ions
30 The Nuclear Atom Rutherford postulated a very small, dense nucleus with the electrons around the outside of the atom. Most of the volume of the atom is empty space Pearson Education, Inc. Atoms, Molecules, and Ions
31 The Proton The positively charged particles in the nucleus are called protons. They have the same charge as an electron but have almost 2,000 times more mass.
32 Rutherford s Atomic Model left one major problem It was known that the hydrogen atom contained one proton and that the helium atom contained two protons. So the mass ratio should have been 2:1. In reality the ratio is 4:1. There must be another particle...
33 The Neutron Was discovered by James Chadwick in It is neutral (uncharged) and has slightly greater mass than a proton. Mystery solved.
34 Shortcomings of Rutherford s Model
35 Classical physics states that a charged particle traveling in a curved path radiates energy. Electrons would continually give off energy, slow down and spiral in towards the nucleus.
36 The properties of atoms and molecules are not governed by the same physical laws as larger objects. Quantum Mechanics: the physics of the very small To be continued
37 The Modern View of Atomic Structure
38 A neutral atom (no electric charge) has the same number of protons and electrons. The area where the negatively charged electrons are found surrounds the nucleus The nucleus containing the positively charged protons and neutral neutrons is comparatively small but contains all most all of the mass in the atom
39 Atoms are composed of PROTONS + positively charged mass = x kg NEUTRONS neutral mass = x kg ELECTRONS negatively charged mass = x kg
40 PROTONS + NEUTRONS neutral positively charged Nucleons General term for a particle found in the nucleus ELECTRONS negatively charged mass = x kg
Updating the Atomic Theory
Updating the Atomic Theory Three major differences between modern atomic theory and Dalton s atomic theory 1. Atoms are NOT indivisible. They are made up of smaller particles: electrons, protons and neutrons.
More information2 Copyright Pearson Education, Inc., or its affiliates. All Rights Reserved.
CHEMISTRY & YOU Chapter 4 Atomic Structure 4.1 Defining the Atom 4.2 Structure of the Nuclear Atom How did scientists determine the structures that are inside an atom? X-rays are used to see structures
More information4.2 Structure of the Nuclear Atom > Chapter 4 Atomic Structure. 4.2 Structure of the Nuclear Atom. 4.1 Defining the Atom
Chapter 4 Atomic Structure 4.1 Defining the Atom 4.2 Structure of the Nuclear Atom 4.3 Distinguishing Among Atoms 1 CHEMISTRY & YOU How did scientists determine the structures that are inside an atom?
More informationPhysics 30 Modern Physics Unit: Atomic Basics
Physics 30 Modern Physics Unit: Atomic Basics Models of the Atom The Greeks believed that if you kept dividing matter into smaller and smaller pieces, you would eventually come to a bit of matter that
More informationChapter 2. Atoms, Molecules, and Ions. Lecture Presentation. John D. Bookstaver St. Charles Community College Cottleville, MO
Lecture Presentation Chapter 2 John D. Bookstaver St. Charles Community College Cottleville, MO Atomic Theory of Matter The theory that atoms are the fundamental building blocks of matter reemerged in
More information2.1 Atomic Theory of Matter
Chapter 2 2.1 Atomic Theory of Matter The theory that atoms are the fundamental building blocks of matter re-emerged in the early nineteenth century, championed by John Dalton. Law of Conservation of Mass
More informationChapter 4. Atomic Structure
Chapter 4 Atomic Structure Warm Up We have not yet discussed this material, but what do you know already?? What is an atom? What are electron, neutrons, and protons? Draw a picture of an atom from what
More informationGlencoe: Chapter 4. The Structure of the Atom
Glencoe: Chapter 4 The Structure of the Atom Section One: Early Ideas about Matter Atomists and Democritus : 400 B.C. From Thrace in Greece. Atoms- Uncut-Table Indivisible parts which cannot be broken
More informationLecture Presentation. Chapter 2. Atoms, Molecules, and Ions. James F. Kirby Quinnipiac University Hamden, CT Pearson Education, Inc.
Lecture Presentation Chapter 2 James F. Kirby Quinnipiac University Hamden, CT Atomic Theory of Matter The theory that atoms are the fundamental building blocks of matter reemerged in the early nineteenth
More informationMemorial to a Scientist
Memorial to a Scientist 1. My Question of Inquiry: Use this sheet to outline how you will collect and present the information to the class. My Group s Scientist: 1 Part I: Memorial to a Scientist: John
More informationChapter 2. and Ions. Chemistry, The Central Science, 11th edition Theodore L. Brown; H. Eugene LeMay, Jr.; and Bruce E. Bursten
Chemistry, The Central Science, 11th edition Theodore L. Brown; H. Eugene LeMay, Jr.; and Bruce E. Bursten Chapter 2 John D. Bookstaver St. Charles Community College Cottleville, MO Atomic Theory of Matter
More informationTopic III Quest Study Guide
Topic III Quest Study Guide A. Early Concepts: Democritus: Democritus: Greek Philosopher 400 B.C. Matter is composed of atoms, which move through empty space Atoms are solid, homogeneous indestructible
More information4.1 Structure of the Atom
4.1 Structure of the Atom How do atoms differ from each other? What are atoms composed of? What are the subatomic particles? 2-1 Structure of the Atom Atoms actually are divisible. They are composed of
More informationAP Atomic Structure Models
AP Atomic Structure Models What is a Model? On a scrap piece of paper, write down your definition of a model with at least two examples. A model is a representation of an object, idea, action, or concept.
More information1. Based on Dalton s evidence, circle the drawing that demonstrates Dalton s model.
Various models of the ATOM Dalton Model John Dalton developed the first atomic model in 1808. Before him people, mostly philosophers, had speculated about the smallest unit of matter and two theories prevailed.
More informationAtomic Structure. History of Atomic Theory
Atomic Structure History of Atomic Theory Democritus (460-370 BC) Was the to come up with the idea of atom Believed that all matter was composed of Which is derived from the Greek word Atomos meaning He
More informationAccelerated Chemistry Study Guide Atomic Structure, Chapter 3
Accelerated Chemistry Study Guide Atomic Structure, Chapter 3 Terms and definitions atom ion law of constant composition isotope atomic theory of matter mass number cathode ray tube atomic mass electron
More informationDemocritus thought atoms were indivisible & indestructible Lacked experimental support 4 th century B.C.
Chapter 5 Democritus thought atoms were indivisible & indestructible Lacked experimental support 4 th century B.C. Democritus thought atoms were indivisible & indestructible Lacked experimental support
More informationEarly Atomic Theories and the Origins of Quantum Theory. Chapter 3.1
Early Atomic Theories and the Origins of Quantum Theory Chapter 3.1 What is Matter Made of? People have wondered about the answer to this question for thousands of years Philosophers Matter is composed
More information7.1 Development of a Modern Atomic Theory
7.1 Development of a Modern Atomic Theory Development of the Atomic Theory Many scientists in different countries have contributed to the understanding of matter - atoms John Dalton Credited with developing
More informationGet out your diagram from your research paper. Get out a sheet of paper to take some notes on.
Bellwork: Get out your diagram from your research paper. Get out a sheet of paper to take some notes on. Fill in the Following Table in your notes (assume an atom unless otherwise stated: Symbol Protons
More informationDemocritus 460 BC 370 BC. First scholar to suggest that atoms existed. Believed that atoms were indivisible and indestructible.
Democritus 460 BC 370 BC First scholar to suggest that atoms existed. Believed that atoms were indivisible and indestructible. Democritus 460 BC 370 BC Problems with theory: 1. Did not explain chemical
More informationTHE BIG IDEA: ELECTRONS AND THE STRUCTURE OF ATOMS
HONORS CHEMISTRY - CHAPTER 4 ATOMIC STRUCTURE OBJECTIVES AND NOTES - V10 NAME: DATE: PAGE: THE BIG IDEA: ELECTRONS AND THE STRUCTURE OF ATOMS Essential Questions 1. What components make up an atom? 2.
More informationGreek Philosophers (cont.)
Greek Philosophers (cont.) Many ancient scholars believed matter was composed of such things as earth, water, air, and fire. Many believed matter could be endlessly divided into smaller and smaller pieces.
More informationCHEMISTRY. Matter and Change. Table Of Contents. Section 4.1 Early Ideas About Matter. Unstable Nuclei and Radioactive Decay
CHEMISTRY 4 Table Of Contents Matter and Change Section 4.1 Early Ideas About Matter Chapter 4: The Structure of the Atom Section 4.2 Section 4.3 Section 4.4 Defining the Atom How Atoms Differ Unstable
More informationChapter 4: Atomic Structure Section 4.1 Defining the Atom
Chapter 4: Atomic Structure Section 4.1 Defining the Atom Early Models of the Atom atom the smallest particle of an element that retains its identity in a chemical reaction Democritus s Atomic Philosophy
More informationNuclear Chemistry. Atomic Structure Notes Start on Slide 20 from the second class lecture
Nuclear Chemistry Atomic Structure Notes Start on Slide 20 from the second class lecture The Birth of an Idea Democritus, 400 B.C. coined the term atom If you divide matter into smaller and smaller pieces,
More information4-1 Notes. Defining the Atom
4-1 Notes Defining the Atom Early Models of the Atom All matter is composed of atoms Atoms are the smallest particles of an element that retains their identity in a chemical reaction Greek philosopher
More informationPSI AP Physics How was it determined that cathode rays possessed a negative charge?
PSI AP Physics 2 Name Chapter Questions 1. How was it determined that cathode rays possessed a negative charge? 2. J. J. Thomson found that cathode rays were really particles, which were subsequently named
More informationDemocritus of Abdera. John Dalton. Dalton s Atom. Dalton s Atomic Theory Ancient Greece - 4th century BC. Eaglesfield, England
Democritus of Abdera Ancient Greece - 4th century BC first suggested the existence of tiny fundamental particles that make up matter. atoms = indestructible did not agree with the current sci theory -
More informationQuantum Physics and Atomic Models Chapter Questions. 1. How was it determined that cathode rays possessed a negative charge?
Quantum Physics and Atomic Models Chapter Questions 1. How was it determined that cathode rays possessed a negative charge? 2. J. J. Thomson found that cathode rays were really particles, which were subsequently
More informationCh. 4 Notes THE STRUCTURE OF THE ATOM NOTE: Vocabulary terms are in boldface and underlined. Supporting details are in italics.
Ch. 4 Notes THE STRUCTURE OF THE ATOM NOTE: Vocabulary terms are in boldface and underlined. Supporting details are in italics. I. Early Ideas About Matter A. atom the smallest particle of an element retaining
More informationAtomic Theory. Democritus to the Planetary Model
Atomic Theory Democritus to the Planetary Model Democritus Greek philosopher (460-370 BCE) Believed in the philosophy of materialism With Leucippus, they though that matter can not be divided infinitely.
More informationChapter 4 The Atom. Philosophers and scientists have proposed many ideas on the structure of atoms.
Chapter4 TheAtom 4.1 Early Models of the Atom An atom is the smallest particle of an element that retains its identity in a chemical reaction. Philosophers and scientists have proposed many ideas on the
More informationAtomic Structure. ppst.com
Atomic Structure ppst.com Defining the Atom The Greek philosopher (460 B.C. 370 B.C.) was among the first to suggest the existence of atoms (from the Greek word ) He believed that atoms were and His ideas
More information9/23/2012. Democritus 400 B.C. Greek philosopher Proposed that all materials are made from atoms. Coined Greek word atmos, meaning indivisible.
Mr. Sudbury Atoms are too small to see with your eyes. Atoms are too small to see with the most powerful microscopes. Scientist use models to explain atoms. A scientific model is an representation containing
More informationChapter 1. Study of chemistry Classification of Matter Properties of Mater Unit of Measurements Uncertainty of Measurements Dimensional Analysis
Chapter 1 Completed Chapter Study of chemistry Classification of Matter Properties of Mater Unit of Measurements Uncertainty of Measurements Dimensional Analysis Quiz Next Thurs- Problems taken from Book
More informationDalton Thompson Rutherford Bohr Modern Model ("Wave. Models of the Atom
Dalton Thompson Rutherford Bohr Modern Model ("Wave Models of the Atom Mechanical" Model) Aim: To discuss the scientists and their contributions to the current atomic model. Focus: Rutherford's Gold Foil
More informationCH4 HOMEWORK : ATOMIC STRUCTURE
Name Date Class 4 CH4 HOMEWORK : ATOMIC STRUCTURE SECTION 4.1 DEFINING THE ATOM (pages 101 103) This section describes early atomic theories of matter and provides ways to understand the tiny size of individual
More informationThe Structure of the Atom
Main Ideas Atoms contain positive and negative particles. Atoms have small, dense, positively-charged nuclei. A nucleus contains protons and neutrons. The radii of atoms are expressed in picometers. FIGURE
More informationChapter 3 https://youtu.be/thndxfdkzzs?list=pl8dpuualjx tphzzyuwy6fyeax9mqq8ogr
Chapter 3 https://youtu.be/thndxfdkzzs?list=pl8dpuualjx tphzzyuwy6fyeax9mqq8ogr The smallest particle of an element that retains the chemical properties of that element. Regions: Nucleus: very small region
More informationJJ Thompson (1897) Robert Millikan (1909)
Atomic Structure Matter Consists of Particles Aristotle Democritus John Dalton 183 I am a genius! Atomic Theory of Matter based on the following postulates: 1) Each element is composed of particles called
More informationCHAPTER -4 STRUCTURE OF ATOM CONCEPT DETAILS
CHAPTER -4 STRUCTURE OF ATOM CONCEPT DETAILS KEY CONCEPTS : [ *rating as per the significance of concept] 1. Dalton s Atomic theory ** 2. J J Thomson Experiments *** 3. Rutherford s Scattering Experiments
More informationRhonda Alexander IC Science Robert E. Lee
Rhonda Alexander IC Science Robert E. Lee Atom The smallest particle of an element that retains all of the chemical properties of the element. The Theory & Evidence for John Dalton s Atomic Theory: Around
More informationChapter 5. Early Atomic Theory and Structure
Chapter 5 Early Atomic Theory and Structure 1 5.1 Early thoughts ~ 400 B.C. Greek philosophers Empedocles all matter was composed of four elements earth, air, water, fire Democritus all forms of matter
More informationAtomic Structure Discovered. Dalton s Atomic Theory. Discovery of the Electron 10/30/2012
Atomic Structure Discovered Ancient Greeks Democritus (460-362 BC) - indivisible particles called atoms Prevailing argument (Plato and Aristotle) - matter is continuously and infinitely divisible John
More informationChapter 2 Atoms and Elements
1 Chapter 2 Atoms and Elements Sec 2.3 Modern Atomic Theory and the Laws That Led to it Law of conservation of mass states that in a chemical reaction, matter is neither created nor destroyed. Law of definite
More informationEvolution of Atomic Theory
Evolution of Atomic Theory Mrs. Baldessari Chemistry Scientists that changed our view of the atom?greatest Chemistry Discoveries?? YouTube Aristotle What: All matter is a combo of fire, air, earth or water
More informationChapter 4 Atomic Structure. Chemistry- Lookabaugh Moore High School
Chapter 4 Atomic Structure Chemistry- Lookabaugh Moore High School Section 4.1 Defining the Atom Democritus (460 B.C 370 B.C.) first used the term atomon to describe the smallest particle of matter possible.
More informationChapter 5. Early Atomic Theory and Structure
Chapter 5 Early Atomic Theory and Structure Introduction to General, Organic, and Biochemistry 10e John Wiley & Sons, Inc Morris Hein, Scott Pattison, and Susan Arena Lightning occurs when electrons move
More informationHistory of the OBJECTIVES. ESSENTIAL QUESTION What evidence is there for the existence of atoms and their sub-atomic particles?
History of the 09/15/2016 OBJECTIVES Understand the law of definite proportions. Define a scientific law and identify how observations become a law. Explain that a scientific theory is not established
More informationEARLY VIEWS: The Ancient Greeks
Feb 7 11:59 AM EARLY VIEWS: The Ancient Greeks Empedocles (c. 450 B.C.) proposed Four Element theory he thought that matter was composed of four elements: AIR, EARTH, FIRE and WATER elements mixed together
More informationThe History of the Atom. How did we learn about the atom?
The History of the Atom How did we learn about the atom? The Atomic Theory of Matter All matter is made up of fundamental particles. What does fundamental mean? The Greek Philosophers, 400 B.C. Democritus
More information5 Early Atomic Theory and Structure
5 Early Atomic Theory and Structure Chapter Outline 5.1 5.2 Electric Charge A. Discovery of Ions 5.3 Subatomic Parts of the Atom Lightning occurs when electrons move to neutralize charge difference between
More informationWhat is matter? Matter is anything that has mass and takes up space. Matter is made up of atoms.
Matter What is matter? Matter is anything that has mass and takes up space. Matter is made up of atoms. Is it matter? Can you measure the object? Does it take up space? Does the object have a mass? Come
More informationATOMS AND ELEMENTS. Democritus 400 B.C. Atomic Theory of Matter. Dalton s Postulates (1803) Page 1
ATOMS AND ELEMENTS Democritus 400 BC Believed that matter was composed of invisible particles of matter he called atoms According to Democritus, atoms could not be broken into smaller particles Atomic
More informationDemocritus & Leucippus (~400 BC) Greek philosophers: first to propose that matter is made up of particles called atomos, the Greek word for atoms
AP Chemistry Ms. Ye Name Date Block The Evolution of the Atomic Model Since atoms are too small to see even with a very powerful microscope, scientists rely upon indirect evidence and models to help them
More informationChapter 2 Atoms, Molecules, and Ions. 許富銀 ( Hsu Fu-Yin)
Chapter 2 Atoms, Molecules, and Ions 許富銀 ( Hsu Fu-Yin) 1 The Atomic Theory of Matter Democritus (460 370 bce) and other early Greek philosophers described the material world as made up of tiny, indivisible
More informationDescribeDemocritus s Democritus s ideas
Atomic Structure Section 4.1 Defining the Atom DescribeDemocritus s Democritus s ideas about atoms. Section 4.1 Defining the Atom Explain Dalton s atomic theory. Section 4.1 Defining the Atom Identifywhat
More informationPROGRESSION OF THE ATOMIC MODEL
PROGRESSION OF THE ATOMIC MODEL By 1808, it was widely accepted that matter was made up of ELEMENTS, which consisted of tiny PARTICLES called ATOMS. After 2000 years - DEMOCRITUS was right all along John
More informationDirected Reading B. Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY. is a(n). DALTON S ATOMIC THEORY BASED ON EXPERIMENTS
Skills Worksheet Directed Reading B Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY 1. The word atom comes from the Greek word atomos, which means a. dividable. b. invisible. c.
More informationEarly Atomic Models. Atoms: the smallest particle of an element that retains the properties of that element.
Chapter 5 Early Atomic Models Atoms: the smallest particle of an element that retains the properties of that element. (Greek: atomos = indivisible) Democritus (Greek teacher in the 4 th century BC) First
More informationEarly Atomic Theory. Alchemy. The atom
Early Atomic Theory Chapter 3 Democritus 460 BC- ~ 370 BC Nothing exists except atoms and empty space; everything else is opinion. Matter is composed of small indivisible particles, atomos meaning Indivisible
More informationChapter 4. The structure of the atom. AL-COS Objectives 1, 2,3,4,7, 10, 15, 20, 21, 22, 27and 28
Chapter 4 The structure of the atom AL-COS Objectives 1, 2,3,4,7, 10, 15, 20, 21, 22, 27and 28 You ll learn to Identify the experiments that led to the development of the nuclear model of atomic structure
More informationBravo 15,000 kilotons
Bravo 15,000 kilotons All matter is composed of atoms Atoms cannot be subdivided, created, or destroyed in ordinary chemical reactions. However, these changes CAN occur in nuclear reactions! Atoms of an
More informationThe idea of an atom began about 400 B.C. with many Greek philosophers, like Democritus, working to figure out what everything was made of.
The idea of an atom began about 400 B.C. with many Greek philosophers, like Democritus, working to figure out what everything was made of. Always move & join together Atomas means indivisible I m Aristotle
More informationEarly Models of the Atom
Early Models of the Atom An atom is the smallest particle of an element that retains its identity in a chemical reaction. Although early philosophers and scientists could not observe individual atoms,
More informationAtomic Theory. Developing the Nuclear Model of the Atom. Saturday, January 20, 18
Atomic Theory Developing the Nuclear Model of the Atom Democritus Theory: Atom, the indivisible particle c. 300 BC Democritus Problem: No scientific evidence c. 300 BC Dalton Theory: The solid sphere model
More informationMake sure this is handed in!
Make sure this is handed in! Based on the 3 groups in early atomic history, pick one of the groups and explain how they progressed the current knowledge of atoms and elements at their time. OR Explain
More informationChemistry Chapter 3. Atoms: The Building Blocks of Matter
Chemistry Chapter 3 Atoms: The Building Blocks of Matter I. From Philosophical Idea to Scientific Theory History of the Atom The Ancient Greeks were the first to come up with the idea of the atom. Democritus
More informationWhat is Radiation? Física da Radiação MEBiom 2016/2017 Patrícia Gonçalves. Supporting Slides and images
What is Radiation? Física da Radiação MEBiom 2016/2017 Patrícia Gonçalves Supporting Slides and images Radiation? Radiation is energy that comes from a source and travels through some material or through
More informationAtomic Structure. Chemistry Timeline #1 B.C. 400 B.C. Demokritos and Leucippos use the term "atomos. Chemistry Timeline #2
Atomic Structure Ch 2 Atomic Structure and Periodicity Big Idea #1: The chemical elements are fundamental building materials of matter, and all matter can be understood in terms of arrangements of atoms.
More informationWhere are we? Check-In
Where are we? Check-In ü Building Blocks of Matter ü Moles, molecules, grams, gases, ü The Bohr Model solutions, and percent composition Coulomb s Law ü Empirical and Molecular formulas Photoelectron Spectroscopy
More informationHistory of Atomic Theory
Unit 2 The Atom History of Atomic Theory A. Democritus and Aristotle Democritus named the "atom" - means indivisible Dalton (with work of Lavoisier, Proust, and Gay-Lussac) 1. atomic theory - first based
More informationAtom s Structure. Chemistry is the study of the structure, characteristics and behavior of matter. The basic
AlMarzooqi 1 Hamad AlMarzooqi Professor Kafle ESL 015 26 February 2013 Atom s Structure Chemistry is the study of the structure, characteristics and behavior of matter. The basic unit of matter is an atom,
More informationCHEMISTRY. CHM201 Class #2 CHEMISTRY. Chapter 1 Continued. Chapter 1 Outline for Class #2. Particles of Matter: Measurements and the Tools of Science
CHEMISTRY Fifth Edition Gilbert Kirss Foster Bretz Davies CHM201 Class #2 Chemistry, 5 th Edition Copyright 2017, W. W. Norton & Company CHEMISTRY Fifth Edition Gilbert Kirss Foster Bretz Davies Chapter
More informationAtomic Structure. Chemistry Mr. McKenzie
Atomic Structure Chemistry Mr. McKenzie How was the understanding of the atom developed? John Dalton (1766-1844) - developed a model to explain observations made at the time 1. Elements are made of tiny
More informationGeneral Chemistry Standard : Identify the significance of the various outcomes of Thomson s and Rutherford s experiments
Not the history of the atom, but the idea of the atom The atom was not discovered until recently Original Idea Ancient Greece (400 BC) Proposed by lesser-known scientists They looked at a beach made of
More informationAtomic Structure. A model uses familiar ideas to explain unfamiliar facts observed in nature.
Atomic Structure 1 2 This model of the atom may look familiar to you. This is the Bohr model. In this model, the nucleus is orbited by electrons, which are in different energy levels. A model uses familiar
More informationWhat is matter? Matter is anything that has mass and takes up space. What is matter made of??
What is matter? Matter is anything that has mass and takes up space What is matter made of?? Atoms. All matter is made of atoms. Atoms are the building blocks of Matter Remember???? The Cell theory - 3
More informationAtoms and their structure
Atoms and their structure History of atomic theory Not the history of atom, but the idea of the atom Original idea Ancient Greece (400 B.C..) Democritus and Leucippus Greek philosophers Another Greek Aristotle
More informationThe Beginning of the Atom
The Beginning of the Atom Democritus s Atomic Philosophy 460BC 370BC ~ Believed atoms were indivisible and indestructible Dalton took it and ran with it 2000 yrs later! Jan 31 3:33 PM Dalton and the Atomic
More informationCh 2: Atoms, Molecules, and Ions
AP Chemistry: Atoms, Molecules, and Ions Lecture Outline 2.1 The Atomic Theory of Matter Greek philosophers: Can matter be subdivided into fundamental particles? Democritus (460 370 BC): All matter can
More informationChapter 2: The Atomic Nature of Matter Olmsted and Williams, 3 rd Edition
Chapter 2: The Atomic Nature of Matter Olmsted and Williams, 3 rd Edition HW: 5, 7, 10, 13, 15, 17, 19, 22, 23, 27, 30, 31, 35, 36, 41, 42, 59, 63, 69, 70 Atomic Theory and How It Came About Aristotle
More informationThe structure of Atom III
The structure of Atom III Atomic Structure If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generations of creatures, what statement
More informationAtomic Theory The earliest recorded information about changes in matter come from the early Greeks so it is often referred to as the Greek Model. Anci
Atomic Theory A theory - a thoroughly tested explanation. With more information the explanations change, hopefully the explanations get better, explain more behaviors. While the old theory still works,
More informationAtomic Theory Timeline
Atomic Theory Timeline Democritus 450 B.C. Democritus was a Greek philosopher who came to the conclusion that everything was made up of tiny particles. He used the term atomos. Unfortunately, since Democritus
More informationChapter 2 Atoms, Ions, and the Periodic Table. Law of Conservation of Mass. Law of Conservation of Mass
Chapter 2 Atoms, Ions, and the Periodic Table Dalton s Atomic Theory Structure of the Atom Ions Atomic Mass The Periodic Table Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction
More informationName Date Class ATOMIC STRUCTURE
4 ATOMIC STRUCTURE SECTION 4.1 DEFINING THE ATOM (pages 101 103) This section describes early atomic theories of matter and provides ways to understand the tiny size of individual atoms. Early Models of
More informationIntroduction to Atomic Structure Multiple Choice HW
Introduction to Atomic Structure Multiple Choice HW PSI Chemistry Name------------------------------------------- Energy and Light 1. What principle is responsible for the pattern below: 2. This principal
More informationChapter 11 Study Questions Name: Class:
Chapter 11 Study Questions Name: Class: Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. The discovery of which particle proved that the atom
More informationDo Now: Recall 1. What is an atom? What have you learned about the word atom so far this semester?
Chemistry Ms. Ye Name Date Block Do Now: Recall 1. What is an atom? What have you learned about the word atom so far this semester? Atoms Video: 1. Proper Portioned Giant Atom Model of Science: Structure
More informationProfessor K. Atomic structure
Professor K Atomic structure Review Reaction- the formation and breaking of chemical bonds Bond- a transfer or sharing of electrons Electrons Abbreviated e - What are they? How were they discovered? Early
More informationVISUAL PHYSICS ONLINE EARLY MODELS OF THE ATOM
VISUAL PHYSICS ONLINE EARLY MODELS OF THE ATOM The atom was believed to be smallest building block of matter and an indivisible unit, until the late 19 th century. There was no direct evidence that atoms
More informationBEGINNING OF ATOMIC THEORY
Skills Worksheet Directed Reading B Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY 1. What does the word atom mean? a. dividable b. invisible c. hard particles d. not able to
More informationThe Development of Atomic Theory
The Development of Atomic Theory Democritus (400 BC) John Dalton (1803) J.J. Thomson (1897) Ernest Rutherford (1911) James Chadwick (1932) - suggested that matter is composed of indivisible particles called
More informationChemistry. Robert Taggart
Chemistry Robert Taggart Table of Contents To the Student..................................................v Unit 1: Matter and Measurement Lesson 1: Chemistry and the Scientific Method...................3
More informationName Class Date. Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY
Skills Worksheet Directed Reading A Section: Development of the Atomic Theory THE BEGINNING OF ATOMIC THEORY Write the letter of the correct answer in the space provided. 1. Around 440 BCE, who thought
More informationMass number i. Example U (uranium 235) and U (uranium 238) atomic number e. Average atomic mass weighted of the isotopes of that element i.
CP NT Ch. 4&25 I. Atomic Theory and Structure of the Atom a. Democritus all matter consists of very small, indivisible particles, which he named i. Atom smallest particle of an element that retains all
More informationCLASS 11th. Structure of Atom
CLASS 11th Structure of Atom 01. Introduction John Dalton 1808, believed that matter is made up of extremely minute indivisible particles, called atom which takes part in chemical reactions. These particle
More information