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  4. The calculated magnetic moment of a divalent ion of an atom with atomic number 24 in aqueous solution is

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Q. The calculated magnetic moment of a divalent ion of an atom with atomic number $24$ in aqueous solution is

KEAMKEAM 2014The d-and f-Block Elements

Solution:

${ }_{24} M =1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 3 d^{5}, 4 s^{1} $

$=[ Ar ] 3 d^{5} 4 s^{1}$

$ M^{2+} =[ Ar ] 3 d^{4} $

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$\therefore $ Number of unpaired electrons $=4$

$\therefore $ Mognetic moment; $\mu=\sqrt{n(n+2)}$

$\therefore \mu=\sqrt{4(4+2)}$

$=\sqrt{24}=4.90 \,BM$