Answer
Bismuth - 208 is radioactive. Its one less neutron (125 to 126) places it outside the band of stability.
Work Step by Step
Bismuth - 209 is stable because it has the perfect neutron to proton ratio for stability.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 21 - Nuclear Chemistry - Exercises - Page 947: 21.21b
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