Answer
+1
Work Step by Step
$K:[Ar]4s^{1}$
The atomic number for argon is 18, which means there are $S=18$ electrons.
$Z_{eff}$$=$$Z-S$$=19-18$$=+1$
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 376: 59a
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