Identify the structure of melamine

Melamine is 2,4,6-triamino-1,3,5-triazine.

Its ring is a 1,3,5-triazine ring, which is a six-membered aromatic ring containing:

• 3 carbon atoms
• 3 nitrogen atoms in the ring

Also, it has 3 amino groups $(-NH_2)$ attached to the ring.

Count lone pairs on ring nitrogens

In the triazine ring, there are 3 ring nitrogen atoms.

Each pyridine-like ring nitrogen contributes:

• one lone pair

So, lone pairs from ring nitrogens: $3 \times 1 = 3$

Count lone pairs on amino nitrogens

There are 3 amino groups $(-NH_2)$, hence 3 amino nitrogens.

Each amino nitrogen has:

• one lone pair

So, lone pairs from amino nitrogens: $3 \times 1 = 3$

Total lone pairs

$\text{Total lone pairs} = 3 + 3 = 6$

Final answer

The total number of lone pairs of electrons in melamine is: $\boxed{6}$

Comparison with stored correct answer

Stored correct answer = $6$

Our derived answer = $6$

Hence, they agree.