Calculate the number of unpaired electrons in the following gaseous ions: $Mn ^{3+}, Cr ^{3+}, V ^{3+}$ and $T i^{3+} .$ Which one of these is the most stable in aqueous solution?

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  Gaseous ions Number of unpaired electrons
$(i)$ $Mn ^{3+},[ Ar ] \,3 d^{4}$ $4$
$(ii)$ $Cr ^{3+},[ Ar ] \,3 d^{3}$ $3$
$(iii)$ $V ^{3+},[ Ar ] \,3 d^{2}$ $2$
$(iv)$ $Ti ^{3+},[ Ar ]\, 3 d^{1}$ $1$

$Cr ^{3+}$ is the most stable in aqueous solutions owing owing to a $^{t_{2g}^{3}}$ configuration.

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