the atomic theory 1.atomic theory matching 2.atom size 3.democritus 4.dalton – ball model 5.j.j....

The Atomic Theory1. Atomic Theory Matching2. Atom Size3. Democritus4. Dalton – Ball Model5. J.J. Thompson – Raisin Bun

Model6. Rutherford – Gold Foil

Experiment7. Bohr – Energy Level Model

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Whose theory was it anyways?

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- Match the scientist with his model of the atom as well as his atomic explanation.

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

___________

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 …………….

……………….

J.J. Thomson

In 1897 J.J. Thomson demonstrated that ……………….

After further investigation he concluded that the same negatively charged ………….

___________

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

• ___________

Ernest Rutherford’sGold Foil Experiment - 1911

“+” charged …………

___________

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What he actually found

Most of the alpha particles slightly deflected and carried on but some bounced backwards

___________

Rutherford’s Gold Foil Experiment

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

……………..

The Rutherford Atomic ModelBased on his experimental

evidence he concluded that the atom: …………….. Contains a …………..

___________

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The Bohr-Rutherford Model

_______________

Electrons move in ……………

Electrons more or less stay in their orbit unless ………….

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