Answer
Please see the work below.
Work Step by Step
We know that the $\alpha$ emission decreases the number by 4 while $\beta$ emission doesn't affect the mass number.$Rn^{219}_{86}$ belongs to the $U^{235}_{92}$ decay series.
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 - Questions and Problems - Page 869: 20.45
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