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9 Cards in this Set
- Front
- Back
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element |
substance that cannot be chemically broken down into simpler substances |
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atom |
smallest part of an element that can be identified as an element |
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nucleus |
center, or core, of an atom |
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proton |
particle that has a positive charge |
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neutron |
particle that has no charge |
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electron |
particle that has a negative charge |
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atomic number |
number of protons in the nucleus of an atom |
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atomic mass |
total mass of the protons and neutrons in an atom, measured in atomic mass units (amu) |
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mass number |
number of protons and neutrons in the nucleus of an atom |
