Answer
Positron($\beta^{+}$). The symbol is $^{0}_{+1}e$.
Work Step by Step
It is the positron which has a positive charge and a mass number 0.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 5 - Section 5.1 - Natural Radioactivity - Study Check 5.1 - Page 137: 1
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