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| the smallest particle of an element that retains its identity in a chemical reaction |
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| 460 BC- was among the first to suggest the existence of atoms. |
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| 1766-1844)- an English Chemist and schoolteacher. Studied the ratios in which elements combine in chemical reactions |
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| 1856-1940)- discovered the electron |
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| Negatively charged subatomic particles |
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| (1868-1953)-carried out experiments to find the quantity of charge carried out by an electron. |
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| Positively charged subatomic particles |
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| Subatomic particles with no charge but with a mass nearly equal to that of a proton |
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| The central core of an atom... has protons and neutrons |
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