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: 49a

Answer

Vandium or Arsenic.

Work Step by Step

The electron configuration in the fourth period with five valance elctrons can either be $[Ar]4s^{2}3d^{3}$ or $[Ar]4s^{2}3d^{10}4p^{3}$, which corresponds to the elements vandium and arsenic.
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