Answer
Selenium gains two electrons when it forms an ion.
Work Step by Step
Selenium is in group 6, meaning that it must gain two valence electrons to equal 8.
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
Chapter 6 - Section 6.1 - Ions: Transfer of Electrons - Questions and Problems - Page 171: 6.2b
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