Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 8 - Sections 8.1-8.9 - Exercises - Problems by Topic: 52d

Answer

Six valance electrons; Gain electrons.

Work Step by Step

Selenium is a main group element. Therefore, its valance electrons are those in the outermost energy principal level. The noble gas configuration for selenium is $[Ar]4s^{2}3d^{10}4p^{4}$. Therefore, selenium has six valance electron. Since, Selenium is a non-metal, it will gain electrons in chemical reactions.
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