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Among the following series of transition metal ions, the one where all metals ions have $3 d^2$ electronic configuration is
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$\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}, \mathrm{Mn}^{5+}$
$T i_{22}=3 d^2 4 s^2 ;
T i^{2+}=3 d^2$
$V_{23}=3 d^3 4 s^2 ; \quad V^{2+}=3 d^2$
$\mathrm{Cr}_{24}=3 d^4 4 s^2 ; \quad \mathrm{Cr}^{4+}=3 d^2$
$M n_{25}=3 d^5 4 s^2 ; M n^{5+}=3 d^2$
T i^{2+}=3 d^2$
$V_{23}=3 d^3 4 s^2 ; \quad V^{2+}=3 d^2$
$\mathrm{Cr}_{24}=3 d^4 4 s^2 ; \quad \mathrm{Cr}^{4+}=3 d^2$
$M n_{25}=3 d^5 4 s^2 ; M n^{5+}=3 d^2$
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