Answer
Krypton.
Work Step by Step
The element in the fourth period with a complete outer shell has an electron configuration of $[Ar]4s^{2}3d^{10}4p^{6}$ which corresponds to the element krypton.
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: 49d
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