The number of occupied subshell in $C r^{3 +}$ ions is:

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Solution

The correct option is D 6
${C r}^{3 +} i o n \to (Z = 24) \to [N e] {3 S}^{2} {3 P}^{6} {4 S}^{0} {3 d}^{3}$
six occupied subshells $↪$
$\Rightarrow 1 S, 2 S, 3 S, 3 P, 3 p, 3 d$ 4S becomes empty

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