Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 2 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 42: 2


d. One more neutron.

Work Step by Step

The atomic number of phosphorous is 15, meaning there are 15 protons. In 31P, there are 15 protons and 16 neutrons. In 32P, there are 15 protons and 17 neutrons. Therefore, 32P has 1 more neutron. Isotopes are variants of an element with a differing number of neutrons.
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