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7 Cards in this Set

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  • Back
Protons
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.
Atomic mass unit
The SI unit used to express the masses of particles in atoms
Neutron
The particles of the nucleus that have no charge
Atomic number
the number of protons in the nucleus of an atom
Isotopes
Atoms that have the same number of protons but have different numbers of neutrons
Mass number
The sum of the protons and neutrons in an atom
Atomic mass
the weighted average of the masses of all the naturally occuring isotopes of an element