Which statement explains why isotopes have different mass numbers?
A) Isotopes differ in the number of protons each contains.
B) Isotopes differ in the number of electrons each contains.
C) Isotopes differ in the number of neutrons each contains.
D) Isotopes differ in the number of protons and neutrons each contains.
E) Isotopes differ in the number of protons and electrons each contains.
Correct Answer:
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