####7. Magnetic moment 2.83 BM is given by which of the following ions?
(At. nos. $Ti=22, Cr=24, Mn=25, Ni=28$ ):-
[2014]
(a) $Ti^{3+}$
(b) $Ni^{2+}$
(c) $Cr^{3+}$
(d) $Mn^{2+}$
$\mu=\sqrt{n(n+2)}$
$2.83=\sqrt{n(n+2)}$
On solving $n=2$
$Ni^{2+}$ has two unpaired electrons.
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