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13 Cards in this Set
- Front
- Back
Democritus |
Greek Philosopher,Thought if you cut something in half so many times it would not split he called it an atom. |
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Aristotle |
Disagreed with Democritus |
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Atom |
Smallest particle that has the properties of an element |
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John Dalton |
British chemist, experimented on Democritus |
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J.J. Thomson |
Discovered electrons and that atoms were made up of even smaller particles |
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Ernest Rutherford |
He found out that an atom has a nucleus and later he figured out that the nucleus is made up of smaller things |
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Niels Bohr |
He a new created a theory that electrons behaved in a new way |
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Electrons |
negatively charged particles |
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Nucleus |
A small,dense center that has a positive charge and is surrounded by moving electrons |
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Protons |
Positively charged particles in the nucleus |
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Neutrons |
Contains uncharged particles |
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Electron cloud |
Electrons move within this area |
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4 parts of the atomic theory |
Matter is made up of atoms, atoms cannot be created,divided, or destroyed |
