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"Laughing Philosopher"
1st.
"Don't"
Democritus.
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What contributions did Democritus make?
- Atoms are the smallest unit piece of matter
- "Atomos"
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What does the Democritus's model say/look like?
- Shape/size depend on object.
- Basic shapes.
- ex. circle, square, triangle
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Who is the father of modern atomic theory?
Dalton
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Father of modern atomic theory
"Drink."
Dalton.
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His experiement dealt with combining elements to form compounds?
Dalton
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What contributions did Dalton make?
- Said element are the same shape and had the same matching atoms. (Later found false)
- Atoms are combined in whole number rations to make compounds
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Said element are the same shape and had the same matching atoms. (Later found false)
Atoms are combined in whole number rations to make compounds
Dalton's Contributions.
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Whose experiment...
combined elements to form compounds?
Dalton
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All matter has atoms
The atom is an indivisible sphere
Dalton's model
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What did Dalton's model say?
- All matter had atoms
- The atom was an indivisible sphere
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Improved Dalton's theory.
"The"
Thomson
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What was Thomson's experiment?
Cathode Ray Experiment
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What did the Cathode Ray Experiment do?
- Cathode rays were passed through a magnetic field.
- Atoms attracted to pos. magnet
- Ray are negative electrons
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Rays are negative what?
Rays are negative electrons.
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Whose experiment...
was the Cathode Ray Experiment?
Thomson
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What were Thomson's contributions?
- Subatomic particles
- Discovered the Electron
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What is the "Plum Pudding" Model?
A nickname for Thomson's model for atoms.
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Who experiment...
Studied uranium and found that it emitted 'rays' on photographic film?
Becquerel
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What was Becquerel's experiment?
He studied uranium and found that it emitted 'rays' on photographic film.
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Which two scientists don't have a model?
Becquerel and Chadwick
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What were Becquerel's contributions?
The "rays" were actually radiation later named by Marie Curie
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Improved Thomson's theory.
"Milk"
Millikan
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What was Millikan's experiment?
The Oil Drop Experiment
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Whose experiment...
was the Oil Drop Experiment?
Millikan
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Whose contributions determined the charge of an electron?
Millikan
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His contribution determined the charge of an electron.
Millikan
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Improved Thomson's Model
"Right"
Rutherford
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Whose experiment...
was the Gold Foil Experiment?
Rutherford
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What happened during the Gold Foil experiment?
- Shot positive alpha particles at a thin sheet of gold foil
- Most particles went through, while a few deflected
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What was Rutherford's experiment?
Gold Foil experiment
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Whose contributions said...
1. Atoms are mostly empty space
2. Atom have a small, dense, positively charged center (Nucleus)
Rutherford
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During the Gold Foil experiment, 9,999 alpha particles out of 10,000 went straight the gold foil. What can be concluded?
Atoms are made of empty space
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During the Gold Foil experiment, 1 out of 10,000 alpha particles were dramatically deflected What can be concluded?
Atoms had a dense, positively charged center (Nucleus).
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What did Rutherford's contribution say?
- Atoms are mostly empty space
- Atoms have a small, dense, positively charged center (Nucleus)
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Improved on Rutherford's atoms
"Before"
Bohr
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Whose experiment...
1. Added energy to atoms
2. Studied spectral lines
Bohr
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