Answer
$_2^1He$ can't be correct.
Work Step by Step
The mass number (in the top left corner) can never be less than the number of protons (in the lower left corner), so this is not possible.
Chemistry (7th Edition)
by McMurry, John E.; Fay, Robert C.; Robinson, Jill Kirsten
Published by
Pearson
ISBN 10:
0321943171
ISBN 13:
978-0-32194-317-0
Chapter 2 - Atoms, Molecules, and Ions - Section Problems - Page 74: 105
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