Answer
Please see the work below.
Work Step by Step
We know that the number of protons=mass number-number of neutrons=81-46=35
The element with $Z=35$ is bormine which is symbolically represented as $Br^{81}_{36}$.
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 2 - Atoms, Molecules, and Ions - Questions and Problems - Page 85: 2.109
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