Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.24b

Answer

The difference between 14-N and 15-N is the number of neutrons each isotope contains within its nucleus.

Work Step by Step

Both nitrogen atoms contain the same number of protons, which determines an atoms chemical identity. When the number of neutrons is altered, one can end up with the same element having different atomic masses.
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