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| center point of an atom with positive charges in it. |
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| has mass and takes up space. |
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| tiny bits that cannot be divided. |
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| positively charged particles. |
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| uncharged particles in the nucleus. |
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| negatively charged particles. |
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| a cloud around the nucleus that hold the electrons. |
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| matter can neither be created nor destroyed. |
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| first idea. of named the atom. |
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| experiment with cathode ray. discovered electron. |
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| electrons were arranged in energy levels. |
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