####16. Which one of the following ions has electronic configuration $[Ar] 3 d^{6}$ ?
[2010]
(a) $Ni^{3+}$
(b) $Mn^{3+}$
(c) $Fe^{3+}$
(d) $Co^{3+}$
(At. Nos. $Mn=25, Fe=26, Co=27, Ni=28$ )
$Mn^{3+}:[Ar] 3 d^{4}$
$Fe^{3+}:[Ar] 3 d^{5}$
$Co^{3+}:[Ar] 3 d^{6}$
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