Nitrogen has an electronegativity of 3.0, and hydrogen has an electronegativity of 2.1. Which describes the bond between nitrogen and hydrogen?

nonpolar

very polar covalent

ionic

moderately polar covalent

Moderately polar covalent because the difference in electronegativity is 0.9 which is slightly above the limit

Very polar covalent

Explanation:

When two nonidentical atoms bond covalently the electrons shared between them is unequal. The atom that attracts the most electrons has a higher electron density, making it partially negative, while the other atom becomes partially positive. This type of bonding is called polar covalent bonding.

The type of bond, polar or non-polar is determined by the electronegativity. Electronegativity measures the likelihood of an atom to draw electrons towards itself, thus calculating the distributed electrons among the bonded atoms. As the electronegativity difference between two bonded elements increases so does the polarity.