Answer
Please see the work below.
Work Step by Step
We know that the nulcide symbol for potassium is given as $K^{39}_{19}$
for calcium $Ca^{40}_{20}$
the equation for beta emission is given as
$K^{39}_{19}\rightarrow Ca+^0_{-1}e$
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 20 - Nuclear Chemistry - Exercises - Page 830: 20.1
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