Fill in the Following Table in your notes (assume an atom unless otherwise stated: Symbol Protons Electrons Neutrons Atomic # Mass # 24 Na
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1 Bellwork: Fill in the Following Table in your notes (assume an atom unless otherwise stated: Symbol Protons Electrons Neutrons Atomic # Mass # 24 Na
2 Bellwork: Fill in the Following Table in your notes (assume an atom unless otherwise stated: Symbol Protons Electrons Neutrons Atomic # Mass # 24 Na
3 1. Naturally occurring lead exists as four stable isotopes: 204Pb amu 1.480% 206 Pb amu 23.60% 207Pb amu 22.60% 208Pb amu 52.30%
4 1. Naturally occurring lead exists as four stable isotopes: 204Pb amu 1.480% 206 Pb amu 23.60% 207Pb amu 22.60% 208Pb amu 52.30%
5 Development of the Atomic Theory
6 What does the Greek word atomos mean? The Greek word atomos means not able to be divided or indivisible.
7 Who was Democritus? Democritus was an ancient Greek philosopher who lived from B.C. What did Democritus conclude about cutting matter in half? There was a limit to how far you could divide matter. You would eventually end up with a piece of matter that could not be cut.
8 Why weren t Democritus s ideas accepted? Aristotle believed that matter could be divided into smaller and smaller pieces forever. He held a very strong influence on popular belief and his views on this were accepted for two thousand years.
9 John Dalton Two thousand years later a British chemist and schoolteacher brings back Democritus s idea of the atom He performed many experiments to study how elements join together to form new substances.
10 Summary for Dalton s Atomic Theory Atoms are tiny and indivisible. Atoms can t be created or destroyed. Atoms of the same element are the identical. Atoms of different elements are different. Atoms of different elements combine in simple whole-number ratios to form compounds.
11 Dalton s Theory Experimental evidence Scientific Laws Law of Conservation on Matter You can t create or destroy atoms. Law of Definite Proportions Same compounds are same ratio by mass. Law of Multiple Proportions Different compounds with the same elements are whole number multiples of the atoms. Experiments Scientific Laws Atomic Theory (observations) (Patterns) (Explanations) John Dalton realized that there must be an atom as Democritus first proposed.
12 Expert groups: 5 min. Get together with people who researched the same scientists as you. Discuss what you need to make sure everyone knows about your scientists. Explain his experiment and procedure Discuss his findings and their significance to modern atomic theory Any problems with his ideas
13 Now you are going to the home groups of the number you were given. It is your job as the EXPERT to make sure everyone understands what your scientists did. You will be held responsible for this material. When finished, open the envelope and match the cards.
14 Democritus Atoms are indivisible and indestructible B.C. Dalton Using experimental methods determined that all matter composed of atoms, atoms of different elements are different, one atoms can not be changed into another Thomson Cathode ray Discovered electron 1897 Millikan Oil Drop Experiment Calculated charge and mass of electron 1916
15 Goldstein Cathode Ray Suggested the idea positively charged particles later called protons 1886 Chadwick Shot Alpha Particles into beryllium Discovered neutrons 1932 Rutherford Gold- Foil Experiment Discovered the nucleus 1911
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