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| A unifying explaination for a broad range of hypothesys and observations that have been supported by testing |
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| The smallest praticle into which an element can be divided and still be the same substance |
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| The negatively chrged particles found in all atoms |
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| A representation of an object or system |
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| the tiny, extremely dense, positively chrged region in the center of an atom |
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| The region inside an atom where electrons are likely to be found |
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Definition
| The positively chraged particles of the nucleus |
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| The Si unit used to express the masses of the particles in an atom |
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| The particles of the nucleus that have no charge |
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| The number of protons in the nucleus of an atom |
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| Atoms that have the same number of protons, but different numbers of neutrons |
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| The sum of the protons and neutrons in an atom |
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Definition
| The weighed average of the masses of the naturally occuring isotopes of an element |
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