Chemistry: The Central Science (13th Edition)

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

Chapter 21 - Nuclear Chemistry - Exercises - Page 947: 21.22a

Answer

Calcium - 45 has a neutron to proton ratio of 1.25 which is too high to fall into the band of stability. It is therefore radioactive.

Work Step by Step

Calcium - 40 has the magic number 20 of both protons and neutrons making it very stable.
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