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| Basic unit of matter composed of three subatomic particles |
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| The number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus |
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| #of protons and neutrons in an atom. |
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| Positively charged particle located in the nucleus |
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| Negatively charged particle located outside the nucleus |
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| Neutrally charged particle located in the nucleus |
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| Pathway that the electrons travel |
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| Designed a model that depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits. |
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| Established the Modern Atomic Theory. Showed scientifically that the atom existed. |
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