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  4. The magnetic moment (in BM) of Zn 2+ ion according to spin-only formula is

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Q. The magnetic moment (in $BM$) of $Zn ^{2+}$ ion according to spin-only formula is

J & K CETJ & K CET 2006

Solution:

$Z n^{2+}(Z=30):[A r] 3 d^{10} 4 s^{0} ;$
zero unpaired $e^{-}$.
Hence, its magnetic moment is zero.
$\mu=\sqrt{n(n+2)}=\sqrt{0(0+2)} \mu=0$