Answer
See explanation below.
Work Step by Step
$Ra^{2+}$ and $Se^{2-}$ would form radium and selenium by losing and gaining electrons respectively.
Chemistry: The Molecular Nature of Matter and Change 7th Edition
by Silberberg, Martin; Amateis, Patricia
Published by
McGraw-Hill Education
ISBN 10:
007351117X
ISBN 13:
978-0-07351-117-7
Chapter 2 - Problems - Page 85: 2.71
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