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.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
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 - Page 375: 49a
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