General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 8 - Electron Configurations and Periodicity - Questions and Problems - Page 331: 8.51

Answer

Please see the work below.

Work Step by Step

We know that the electronic configuration of Br is given as $1s^2,2s^22p^6,3s^23p^6,4s^23d^{10}4p^5$. The electrons with highest quantum number are $4s^24p^5$.Hence, Br has seven valence electrons.
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