Understanding the Basics

* Carbon (C): Carbon wants to form four bonds.

* Nitrogen (N): Nitrogen wants to form three bonds.

The C-N Bond

Since the carbon and nitrogen are already sharing one bond, we need to figure out how many more bonds each element needs.

* Carbon: Needs 3 more bonds (4 total - 1 already used).

* Nitrogen: Needs 2 more bonds (3 total - 1 already used).

Adding Hydrogens

We can satisfy these remaining bonding requirements by adding hydrogen atoms (H), which form one bond each.

* Carbon: Needs 3 more bonds, so we add 3 hydrogens.

* Nitrogen: Needs 2 more bonds, so we add 2 hydrogens.

The Result

The completed molecule would look like this:

H

|

H-C-N-H

|

H

Therefore, a total of 5 hydrogens would be required to complete the molecule.