Finding Bond Polarity?

Question

Rank the following bonds from least polar to most polar:

Ge−F

F−F

K−F

Se−F

As−F

least polar  ______<  _____ < _____<  ______<  ______  most polar

Answer 1

Look up the ∆EN, i.e. the change in electronegativity values of the elements involved in the bond.

Obviously, the difference in F-F is zero, so it is the LEAST polar.

K-F has the greatest ∆EN so it is the MOST polar.

Do the same for the others, and rank them accordingly.