Periodic Trends

AP Chemistry· difficulty 3/5

Z_eff (effective nuclear charge) felt by an outer electron is

A
$Equal to N (neutrons)$
B
$Equal to Z (number of protons)$
C
$Z minus shielding from inner electrons$
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D
$Always 0$

Explanation

Inner electrons shield outer electrons from the full nuclear pull; Z_eff increases left-to-right across a period.

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