Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises: 2.58e

Answer

Charge: -2

Work Step by Step

Atoms of elements want to have the electron configuration of the nearest noble gas (in terms of number of electrons) on the periodic table. In order to get the electron configuration of the nearest noble gas, Krypton, Selenium must gain two electrons, for it is two to the left of Krypton on the periodic table. Thus, the most common charge of a selenium ion is -2.
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