Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 7 - Periodic Properties of the Elements - Exercises: 7.16a

Answer

The effective nuclear charge of Si is $+4$, while that of Cl is $+7$.

Work Step by Step

1) $Si$: The nuclear charge of Si is $Z=+14$. There are 10 core electrons and 4 valence electrons. Each core electron contributes 1.00 and each valence electron contributes 0.00 to the screening constant. Therefore, $S=10\times1.00+4\times0.00=10$ Therefore, the effective nuclear charge of Si is $$Z_{eff}=Z-S=+14-10=+4$$ 2) $Cl$: The nuclear charge of Cl is $Z=+17$. There are 10 core electrons and 7 valence electrons. Each core electron contributes 1.00 and each valence electron contributes 0.00 to the screening constant. Therefore, $S=10\times1.00+7\times0.00=10$ Therefore, the effective nuclear charge of Cl is $$Z_{eff}=Z-S=+17-10=+7$$
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