Answer
$^{21}_{10}Ne $
Work Step by Step
From the figure we observe that mode of decay is beta decay. Pathway of F-21 beta decay indicates that the missing nucleus should be Ne-21.
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 - Conceptual Problems - Page 948: 105
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