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NEET levelSingle correct optionDifficulty 1 of 3pt058

Using Slater's rules, in which an electron of the $1 s$ group is screened by $0.30$ for each other $1 s$ electron, the effective nuclear charge on a $1 s$ electron of helium ( $Z = 2$ ) is:

A1.70
B2.00
C1.15
D1.65

Answer: A

For He,

S = 1 \times 0.30 = 0.30

, so

Z^{*} = 2 - 0.30 = 1.70

.

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