Question

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By what are isotopes identified?


A.
mass numbers


B.
atomic masses


C.
atomic mass units


D.
average atomic masses

Answer 1

Isotopes are identified by Mass Numbers. The mass number is the definite number of protons + neutrons in THAT SPECIFIC atom you are talking about. For example, Carbon-14 is called that because it has a mass of 14 (6 Protons and 8 Neutrons)