Question

Which element have high polarizing power beryllium or Aluminum?

Answer 1

This is why small cations have high polarizing power ... For example, Beryllium2+ has a higher polarizing power 

Answer 2

For cations with the same radius, the higher the charge is, the larger the polarizing power is. For cations with the same charge, the smaller the radius is, the larger the polarizing power is. The radius of Be2+ is the smallest and its charge is the highest. Therefore, Beryllium has the largest polarizing power.