Which one of the following ions has electronic configuration \( [\mathrm{Ar}] 3 d^{6} ? \quad \)...

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Which one of the following ions has electronic configuration \( [\mathrm{Ar}] 3 d^{6} ? \quad \) (CBSE PMT 2010)
(a) \( \mathrm{Ni}^{3+} \)
(b) \( \mathrm{Mn}^{3+} \)
(c) \( \mathrm{Fe}^{3+} \)
(d) \( \mathrm{Co}^{3+} \)
\( P \)
(At. Nos. \( \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27, \mathrm{Ni}=28 \) )
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