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  4. Effective magnetic moment of Sc3+ ion is

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Q. Effective magnetic moment of $Sc^{3+}$ ion is

Structure of Atom

Solution:

$Sc (Z=21) : 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1$
$Sc^{3+} : 1s^2 2s^2 2p^6 3s^2 3p^6$
No. of unpaired electrons in $Sc^{3+} = 0$
$\therefore $ $\mu$ (spin only) $= \sqrt{n(n+ 2)} = 0$
$\therefore \mu$ (effective) $= 0$