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Calculate the screening constant in Zn. ...

Calculate the screening constant in `Zn`.
a. For a `4 s`-electron b. For a `3 d`-electron

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`Zn_(30) rarr (1s^(2)) (2s^(2) 2p^(6)) (3s^(2) 3p^(6)) (3d^(10)) (4s^(2))`
`sigma = 10 xx 1+(18 xx 0.85) + (1 xx 0.35)`
`= 25.65`
Note : Effective nuclear charge is calculated using following relation.
`Z^(x) = Z - sigma`
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