Answer
$SeO_{4}^{-2}$ : Selenate ion.
Work Step by Step
Since Selenium forms ions similar to Sulfur and $SO_{4}^{-2}$ is a Sulphate ion. Therefore, $SeO_{4}^{-2}$ is a Selenate ion.
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 77: 2.68a
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