Answer
For G-IIA, Period 3:
$X^{2+}$ = 1s2, 2s2, 2p6
For G-VIIA Period 3:
$Y^{-}$ = 1s2, 2s2, 2p6, 3p6
Work Step by Step
As above
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Combining Ideas from Chapters 4 to 6 - Page 209: CI.7d
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