When is a cation highly polarising? Which alkali metal cation has the highest polarising power?

Options

A. `Li^(o+)`
B. `K^(o+)`
C. `Na^(o+)`
D. `Cs^(o+)`

Answer

A

Explanation

`Li^(o+)` ion has the highest ionic `"charge"//("ionic redius")^(2)` ratio. Thus maximum polarising power.