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Q.

Which of the following ions has electronic configuration [Ar] 3d⁶?

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a

$_{27} {Co}^{3 +}$

b

$_{25} {Mn}^{3 +}$

c

$_{28} {Ni}^{2 +}$

d

$_{26} {Fe}^{2 +}$

answer is C.

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Detailed Solution

$_{26} Fe : [Ar] 3 d^{6}, 4 s^{2}_{26} {Fe}^{2 +} : [Ar] 3 d^{6}$

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