Cation polarizing power

[Arya_Naeim_1H]

I was looking at a UA worksheet that said that Mg2+ has a higher polarizing power than Li+. I know that more highly charged cations have a higher polarizing power but Li+ is one row above Mg2+ so I would assume Li+ is smaller. Can someone explain which one has the higher polarizing power and why?

[Maille Flynn 3H]

Even though Li is smaller than Mg, Mg2+ is actually slightly smaller than Li+. There is a table in the textbook in 1F.3 of ionic radii, and Li+ is bigger than Mg2+. So because of that, Mg2+ will have the higher polarizing power.