Which of the following elements in +3 oxidati | vedclass

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(A) $1$. The colour of transition metal ions depends on the presence of unpaired $d$-electrons, which allow for $d-d$ transitions.$2$. The electronic

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$Sc$

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(A) $1$. The colour of transition metal ions depends on the presence of unpaired $d$-electrons, which allow for $d-d$ transitions.$2$. The electronic configuration of $Sc$ $(Z=21)$ is $[Ar] 3d^1 4s^2$. In the $+3$ oxidation state, it becomes $Sc^{3+} = [Ar] 3d^0$.$3$. Since $Sc^{3+}$ has no unpaired electrons ($d^0$ configuration), $d-d$ transitions are not possible, making its compounds colourless.$4$. $Ni^{3+}$, $Cr^{3+}$, and $V^{3+}$ have partially filled $d$-orbitals ($d^7$, $d^3$, and $d^2$ respectively), which allow for $d-d$ transitions, resulting in coloured compounds.

Which of the following elements in $+3$ oxidation state forms colourless compounds?

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