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7 Cards in this Set
- Front
- Back
Protons
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the positively charged particles of the nucleus; the number of protons in a nucleus is the atomic number that determines the identity of an element.
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Atomic mass unit
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The SI unit used to express the masses of particles in atoms
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Neutron
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The particles of the nucleus that have no charge
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Atomic number
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the number of protons in the nucleus of an atom
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Isotopes
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Atoms that have the same number of protons but have different numbers of neutrons
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Mass number
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The sum of the protons and neutrons in an atom
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Atomic mass
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the weighted average of the masses of all the naturally occuring isotopes of an element
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