## Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall

# Chapter 8 - Sections 8.1-8.9 - Exercises - Problems by Topic: 65b

#### Answer

$[Ar]4s^{2}$$3d^{10}$$4p^{5}$ $[Ar]4s^{2}$$3d^{10}$$4p^{6}$ or $[Kr]$

#### Work Step by Step

Write the electron configuration for an uncharged Br atom. One electron must be added to Br to form the ion $Br^{-}$. Add this electrons to its energy level and change the corresponding electron configuration.

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