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Calculate the effective nuclear charge e...

Calculate the effective nuclear charge experienced by the 4s electron in potassium atom .

Text Solution

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The electronic configuration of K atom is
`K_(19)=(1s^(2))(2s^(2)2p^(6))(3s^(2)3p^(6))4s^(1)`
Effective nuclear charge `(Z^(**))=Z-S`
`Z^(**)=19-[(0.85xx"No"`. Of electrons in `(n-1)^(th)("shell")+(1.00` total number of electrons in the inner shells)]
`=19-[0.85xx(8+(1.00xx10)]`
`Z^(**)=2.20`.
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