Calculate the value of `Z_("eff")` for 3d electron of `._(21)Sc`.
Calculate the value of `Z_("eff")` for 3d electron of `._(21)Sc`.
A. `18.69`
B. `21.69`
C. `3.69`
D. `3.00`
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Correct Answer - D
`Sc : (1s^(2)) (2s^(2) 2p^(6)) (3s^(2) 3p^(6)) underset(n^(th))(3d^(1))`
`sigma_(3d) = (0 xx 0.35) + 18 xx 1.00`
`= 18.0`
`Z_("eff") = Z - sigma`
`= 21 - 18.0 = 3.0`
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