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Isotopes of an element differ in the composition of the nucleus. The varying numbers of __________ cause the ___________ of each isotope to also vary.

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User Fesler
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Isotopes vary in the number of neutrons, and thus, the atomic mass varies also since neutron mass is significant.
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User Priboyd
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6 votes

The answer is neutrons, mass number I just had this on a test.

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User Mcneil
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