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The Atomic Theory
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Atomic Theory Matching
Atom Size
Democritus
Dalton – Ball Model
J.J. Thompson – Raisin Bun Model
Rutherford – Gold Foil Experiment
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?
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____________
Atoms are too small in size to study easily
Size of Earth : soda can ……………..
 Simulation
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The Greek philosopher Democritus (460
B.C. – 370 B.C.) was among the first to
suggest the existence of atoms
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___________
Dalton’s Atomic Theory – The
Ball Model: 1800s
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Referred to the atom as a small, hard,
indestructible sphere that cannot be subdivided
___________
An atom is the smallest …………….
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……………….
J.J. Thomson
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In 1897 J.J. Thomson demonstrated that
……………….
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After further investigation he concluded that
the same negatively charged ………….
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___________
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Thomson’s Atomic Model
• Thomson believed that the electrons were
like plums embedded in a positively charged
“pudding”
• ___________
Ernest Rutherford’s
Gold Foil Experiment - 1911
 “+” charged …………
 ___________
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What he actually found
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Most of the alpha particles slightly deflected and
carried on but some bounced backwards
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Rutherford’s Gold Foil
Experiment
Rutherford’s Findings
Most of the particles passed right through
 A few ………………….
 ___________
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The Rutherford Atomic Model
Based on his experimental
evidence he concluded that the
atom:
 ……………..
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Contains a …………..
 ___________
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The Bohr-Rutherford Model
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Electrons move in
……………
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Electrons more or less stay in
their orbit unless ………….
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