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: 21.29d

Answer

The missing particle is an electron. This balances the equation.

Work Step by Step

One must simply balance the mass numbers and atomic numbers on both sides of the equation. The atom is named from the resulting atomic number.
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