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NEET levelSingle correct optionDifficulty 1 of 3pt056

The effective nuclear charge $Z_{eff}$ felt by an electron in a multi-electron atom is given by (with $Z$ the atomic number and $S$ the screening constant):

A $Z_{eff} = Z - S$
B $Z_{eff} = Z + S$
C $Z_{eff} = Z / S$
D $Z_{eff} = S - Z$

Answer: A

The inner and other electrons partly cancel the nuclear attraction, so the net charge felt is the nuclear charge minus the screening constant:

Z_{eff} = Z - S

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