CHEMISTRY COMMUNITY

This questions asks us whether a ligand can be polydentate.

The molecule for part a is HN(CH2CH2NH2)2. While I understand that it would be a tridentate ligand because there are three nitrogen atoms each with lone pairs, are we able to assume this will always be true for nitrogen atoms? Should we be expected to draw lewis structures if given a molecule like this?

I think the safest bet would be to draw out the lewis structure to make sure that the nitrogen does have two electrons to donate and use for a bond.