Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 8 - Section 8.6 - Periodic Trends in the Size of Atoms and Effective Nuclear Charge - Conceptual Connection: 8.5

Answer

The valence electrons of $S$ experience the greatest effective nuclear charge.

Work Step by Step

We know that $Z_{eff}$ increases from left to right across a row in the periodic table. $S$ is the rightmost element out of the given 3, so its valence electrons experience a greater effective nuclear charge than the valence electrons in $Al$ or in $Mg$.
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