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Calculate the effective nuclear charge e...

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

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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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Knowledge Check

  • The effective nuclear charge across the period (from left to right)

    A
    Decreases
    B
    Increases
    C
    First decreases and then increases
    D
    First increases and then decreases

  • In which case, effective nuclear charge is minimum ?

    A
    Be
    B
    `Be^(+2)`
    C
    `Be^(+3)`
    D
    all

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