Compare the structural and magnetic properties of the green manganate ion () and the purple permanga — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Both $MnO_4^{2-}$ and $MnO_4^-$ consist of a central $Mn$ atom surrounded by four oxygen atoms in a tetrahedral arrangement, employing $d^3s$ hybridization. In manganate, $Mn$ is in the $+6$ oxidation state ($3d^1$), making it paramagnetic (green). In permanganate, $Mn$ is in the $+7$ oxidation state ($3d^0$), possessing zero unpaired electrons, rendering it strictly diamagnetic (purple).