Answer
$^{221}_{90}Th → ^{217}_{88}Ra + ^{4}_{2}He$
Work Step by Step
Th-221 undergoes alpha decay to form Ra-217.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 19 - Sections 19.1-19.12 - Exercises - Cumulative Problems - Page 947: 80b
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