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: 52c

Answer

Seven valance electrons; Gain electrons.

Work Step by Step

Bromine is a main group element. Therefore, its valance electrons are those in the outermost energy principal level. The noble gas configuration for Bromine is $[Ar]4s^{2}3d^{10}4p^{5}$. Therefore, Bromine has seven valance electrons. Since, Bromine is a non-metal, it is expected to gain electrons in chemical reactions.
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