name/date/pd: Unit 3 PRACTICE TEST: 1) List the major contributors to atomic theory (in order) in the table below. Then, fill in the rest of the missing information such as their major discoveries, model, or thoughts. (not to scale) Scientist(s)/ philosopher NAMES: Dates: ~440BC Late 1700searly Late 1800s ~1911 ~1913 Modern day 1800s Model name: Picture of model: Discoveries/ Thoughts: All things are made up of, particles that are not able to be Atomic Theory: -All things are composed of. -Atoms combine with other atoms to form Discovered the. using a cathode-raytube. The dots on this model represent the Discovered the, or, charged core of the atom. Performed the experiment. Thought that traveled around the in certain energy or paths. Electrons are found in regions called No or specific location of electrons. 2) What do we know now about atoms that we didn t know in the early 1900s? 3) Have we reached an end point in atomic theory and decided on the final model of the atom? Explain why or why not:
4) Using the particle types listed to the right, answer the following questions: Which particle type(s) would you draw in the nucleus of an atom? What would you call particle c? What would you call particle b? What would you call particle a? What particle type(s) would you draw outside of the nucleus? a) b) c) 5) Using the particle types as shown above as a key, draw each atom or isotope below (nucleus and electron shells) Helium-5 Hydrogen-1 Hydrogen-2 Hydrogen-3 6) Using the particle types used above as a key, draw what the NUCLEUS only would look like of each isotope below: Boron-9 Boron-13 Boron-30 Boron-6 7) For the statements below. Classify whether they best describe bohr s model of the atom by writing bohr, or Schrodinger and Heisenberg s Electron Cloud model, by writing S&H two dimensional model three dimensional model visualization of electrons in specific energy levels electrons have no exact location - just a probability mathematical/statistical model physical model Use your periodic table to answer the following questions: 8) How are elements arranged on the periodic table as you read across a period? Elements are arranged by as you read across each period. 9a) Groups are the columns on the periodic table. (direction) 9b) Periods are rows on the periodic table. 10) What type of elements are most of the elements on the periodic table? 11) What element is in Group Period Chemical Symbol 17 2 2 5 13 3 11 6
12) Elements that are in the same often have similar properties. 14) Your teacher gives you a mystery element and tells you it is found on the left side of the periodic table. What could you most likely classify the element as being, just by knowing that information? Why? 15) non-metals are found to the of the stair-step line. Metals are found to the of the stair-step line. 16a) Classify the properties in the box to the right as describing metals, nonmetals or metalloids. PROPERTIES OF METALS PROPERTIES OF NONMETALS Lustrous (shiny) Ductile Good conductor Not a good conductor Malleable Brittle 16b) Metalloids are often called Why? Metalloids often have properties in between those of and Their metallic properties include (as in the element silicon): Their non-metal properties include: 17) What is the number on top of the chemical symbol called? What does it tell you?, for example, in every atom of Xenon, there are 18) How can you automatically tell what element this is, by looking at the periodic table without knowing any other information? 19) What elements are the ones to the right?: 20) What is an isotope? An Isotope is a version of an atom of the element. They always have the same number of, however, they have differing numbers of Because of this, their number is different. 21) What would happen if an atom of a particular element lost or gained a proton? (hypothetically) It would become a totally different For example 22) What would happen if an atom of a particular element lost or gained a neutron? It would have a different number. It would still, however, remain the same
23) Fill in the table below with the correct number of subatomic particles for each element listed. Use the periodic table if needed. Isotope hyphen Notation Atomic # Mass # (of most # of protons # of electrons # of neutrons common isotope) (of most common isotope) oxygen-17 Titanium-50 Zirconium-92 Sodium-24 REVIEW: Sodium-23 8792 m = km 93km = m 42.5cm= Hm Use the numbers and symbols in the diagram at the right to answer the next question: 1= 2= 3= 4= 5= very quickly 6= very quickly
UNIT 3 CHECKLIST: AM I ABLE TO Describe and identify the chronological (in order by time) contributions and ideas by/of different scientists/philosophers to the model of the atom such as: Democritus and atomos Dalton and the parts of his atomic theory Thomson his main discovery and model Rutherford his main discovery and model Bohr - his main discovery and model. Explain why this model is typically used to represent the atom instead of the cloud model. Heisenberg and Schrodinger s modern theory and atomic model Draw, label the location, and identify the charges and mass of the three basic parts of the atom Proton (location, charge, amu) Electron (location, charge, amu) Neutron (location, charge, amu) Understand that elements in the same group have similar properties Identify what type of elements most of the elements on the periodic table are. Define atom and identify what all atoms of the same element have the same number of. Describe and identify the chronological (in order by time) contributions and ideas by/of different scientists/philosophers to the model of the atom such as: Democritus and atomos Dalton and the parts of his atomic theory Thomson his main discovery and model Rutherford his main discovery and model Bohr - his main discovery and model. Explain why this model is typically used to represent the atom instead of the cloud model. Heisenberg and Schrodinger s modern theory and atomic model Draw, label the location, and identify the charges and mass of the three basic parts of the atom Proton (location, charge, amu) Electron (location, charge, amu) Neutron (location, charge, amu) Understand that elements in the same group have similar properties Identify what type of elements most of the elements on the periodic table are. Define atom and identify what all atoms of the same element have the same number of.