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| the smallest unit of an element that maintains the properties of that element |
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| a subatomic particle that has a negative charge |
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| in physical science, an atom's central region, which is made of protons and neutrons |
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| a region around the nucleus of an atom where electrons are likely to be found |
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| a subatomic particle that has a positive charge and that is located in the nucleus of an atom; equals the atomic number |
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| a unit of mass that describes the mass of an atom or molecule |
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| a subatomic particle that has no charge and that is foundin the nucleus of an atom |
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| the number of protons in the nucleus of an atom |
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| an atom that has the same number of protons as other atoms of the same element do but has a different number of neutrons |
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Definition
| the sum of numbers of protons and neutrons in the nucelus of an atom |
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| the mass of an atom expressed in atomic mass units |
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Term
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Definition
| the mass of an atom expressed in atomic mass units |
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