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why cations with 18 electrons in outermost shell brings greater polarisation of cation than those with 8 electrons

why cations with 18 electrons in outermost shell brings greater polarisation of cation than those with 8 electrons

Grade:11

1 Answers

Simran Vinaik
askIITians Faculty 1230 Points
5 years ago
This is very much true, and can be explained using screening effects of orbitals. In the case ofNa+, it's valence electrons are in thep orbitals, while in the case ofCu+ they are in thed orbitals. It's a known fact that dorbitals shield the electrons from nuclear attractions poorly compared to thep orbitals. As a consequence, the nucleus attracts the valence electrons much more strongly in case ofCu+, leading it to have a smaller size, and more polarizing power.

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