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: 21.22c

Answer

Thorium-230 is radioactive. It has 140 neutrons and only 90 protons putting it well outside the band of stability.

Work Step by Step

The atomic number of lead is 82 which is a magic number of stability. This isotope also lies on the band of stability. Therefore, Pb-206 is a stable isotope.
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