1. The Atomic Theory 1.Atomic Theory Matching 2.Atom Size 3.Democritus 4.Dalton – Ball Model 5.J.J. Thompson – Raisin Bun Model 6.Rutherford – Gold Foil Experiment 7.Bohr – Energy Level Model

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3. Whose theory was it anyways? - WORKSHEET IS INCLUDED WITH LESSON PACKAGE - Match the scientist with his model of the atom as well as his atomic explanation.

4. How are atoms studied? ____________ Atoms are too small in size to study easily Size of Earth : soda can …………….. Simulation  Simulation Removed

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7. The Greek philosopher Democritus (460 B.C. – 370 B.C.) was among the first to suggest the existence of atoms The Greek philosopher Democritus (460 B.C. – 370 B.C.) was among the first to suggest the existence of atoms ___________

8. Dalton’s Atomic Theory – The Ball Model: 1800s Referred to the atom as a small, hard, indestructible sphere that cannot be subdivided ___________ An atom is the smallest ……………. ……………….

9. J.J. Thomson In 1897 J.J. Thomson demonstrated that ………………. After further investigation he concluded that the same negatively charged …………. ___________

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11. Thomson’s Atomic Model Thomson believed that the electrons were like plums embedded in a positively charged “pudding” ___________

12. Ernest Rutherford’s Gold Foil Experiment - 1911  “ +” charged …………  ___________

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14. What he actually found Most of the alpha particles slightly deflected and carried on but some bounced backwards ___________

15. Rutherford’s Gold Foil Experiment

16. Rutherford’s Findings  Most of the particles passed right through  A few ………………….  ___________ ……………..

17. The Rutherford Atomic Model Based on his experimental evidence he concluded that the atom: …………….. Contains a ………….. ___________

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19. The Bohr-Rutherford Model _______________ Electrons move in …………… Electrons more or less stay in their orbit unless …………. Video Removed