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?
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?
| 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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