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"Based on my thinking and discussions, I believe that there is a limit to the number of times that matter can be divided. I will call these particles 'atomos' or atoms." |
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| Responsible for 1st atomic theory: Atoms of the same element are identical and are different from atoms of other elements. |
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| Discovered electrons with his Cathode Ray Tube (CRT) experiments. |
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| Discovered the existence of the small positively charged nucleus of atoms with his Gold Foil experiment |
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| Originator of Quantum Theory |
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| Region around the nucleus where electrons may be found |
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| Center of the atom; contains protons and neutrons |
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| positively changed particle in the nucleus of an atom |
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| neutral particle found in the nucleus of an atom |
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| Negatively charged particle found in the area around the nucleus of an atom |
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| Determines the identity of an element |
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| Responsible for the formation of different isotopes |
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| Responsible for the Reactivity of an element |
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| JJ Thomson's Atomic Model |
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