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An isotope is an atom of an element that varies in mass number due to variation in the number of: A. atoms. B. protons. C. neutrons. D. electrons.
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An isotope is an atom of an element that varies in mass number due to variation in the number of:

A. atoms.
B. protons.
C. neutrons.
D. electrons.

User VuVirt
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C. neutrons///Number of protons determines element, and number of electrons is always same as number of protons in atoms (no charge).
User Leatrice
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