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NEET levelSingle correct optionDifficulty 1 of 3pt057

Among electrons of the same principal shell, which subshell electrons are the least effective in shielding outer electrons from the nucleus?

A $s$
B $f$
C $p$
D $d$

Answer: B

Shielding power of electrons in a given shell follows

s > p > d > f

because diffuse shapes penetrate less. Hence

f

electrons shield least.

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