Question asked by Filo student

- For cations of the same size and charge, the one, with electronic configuration $(n-1)d^{n}n{s}^{\circ }$, typical of transition metals, is more polarising than the one with a noble gas configuration, $n{s}^{2}n{p}^6$, typical of alkali and alkaline earth metal cations. The cation polarises the anion, pulling the electronic charge toward itself and thereby increasing the electronic charge between the two. This is precisely what happens in a covalent bond, i.e., buildup of electron charge density between the nuclei. The polarising power of the cation, the polarisability of the anion and the extent of distortion (polarisation) of anion are the factors, which determine the per cent covalent character of the ionic bond.

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Updated on: Jan 31, 2023