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(B) The stability of transition metal ions in aqueous solution depends on the electronic configuration and crystal field stabilization energy.For $Cr^

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$Cr^{3+}$

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(B) The stability of transition metal ions in aqueous solution depends on the electronic configuration and crystal field stabilization energy.For $Cr^{3+}$ $(3d^3)$,the configuration is $t_{2g}^3$ in an octahedral field,which is a half-filled $t_{2g}$ subshell,providing extra stability.$Mn^{3+}$ $(3d^4)$ is less stable due to the Jahn-Teller distortion.$V^{3+}$ $(3d^2)$ and $Ti^{3+}$ $(3d^1)$ do not have the extra stability associated with the $t_{2g}^3$ configuration.Therefore,$Cr^{3+}$ is the most stable ion in aqueous solution.

Which one of the following ions is the most stable in aqueous solution?
$(At. \ No. \ Ti = 22, V = 23, Cr = 24, Mn = 25)$

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Which one of the following ions is the most stable in aqueous solution?$(At. \ No. \ Ti = 22, V = 23, Cr = 24, Mn = 25)$