Answer
$\frac{84}{36}Kr$
Krypton-84
Work Step by Step
When naming an isotope, the name of the element is always followed by the atomic mass number. The problem states that the atomic mass number is 84 directly, so the isotope is Krypton-84.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.31b
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