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: 49b

Answer

Selenium.

Work Step by Step

The element in the fourth period with four 4p electrons has an electron configuration of $[Ar]4s^{2}3d^{10}4p^{4}$, which corresponds to the element selenium.
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