#### Answer

Isotopes are atoms of the same element with different numbers of neutrons.

#### Work Step by Step

The number of protons defines an element, so the number of neutrons can vary. Each isotope has a different mass number.

Published by
Pearson

ISBN 10:
032191029X

ISBN 13:
978-0-32191-029-5

Isotopes are atoms of the same element with different numbers of neutrons.

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