Answer
a. 2
b. 5
c. 1
d. 2
Work Step by Step
a. Mg has a $3s^2$ configuration
b. Cr has a $3d^{5}4s^1$ configuration
c. Y has a $4d^15s^2$ configuration
d. Pb has a $6s^26p^2$ configuration
Chemistry: Molecular Approach (4th Edition)
by Tro, Nivaldo J.
Published by
Pearson
ISBN 10:
0134112830
ISBN 13:
978-0-13411-283-1
Chapter 8 - Exercises - Page 376: 48
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