The total number of lone-pairs of electrons in melamine is.

Explanation

To determine the total number of lone pairs of electrons in melamine, we can follow these steps:

### Step 1: Understand the Structure of Melamine
Melamine is an organic compound with the formula C3H6N6. It consists of a triazine ring, which contains three nitrogen atoms in a cyclic structure, and three additional nitrogen atoms attached to the ring.

### Step 2: Draw the Lewis Structure
To find the lone pairs, we need to draw the Lewis structure of melamine. The structure consists of:
- A central triazine ring with three nitrogen atoms.
- Three additional nitrogen atoms connected to the triazine ring.

### Step 3: Identify the Valence Electrons
Each nitrogen atom has 5 valence electrons. In melamine, there are a total of 6 nitrogen atoms:
- Total valence electrons from nitrogen = 6 nitrogen × 5 electrons = 30 electrons.

### Step 4: Count the Bonds
In the structure, each nitrogen atom forms bonds with other atoms. The triazine ring has nitrogen-nitrogen bonds and nitrogen-carbon bonds.

### Step 5: Determine Lone Pairs
After drawing the structure and accounting for the bonds:
- Each nitrogen atom in melamine has one lone pair of electrons.
- Since there are 6 nitrogen atoms, we have a total of 6 lone pairs of electrons.

### Conclusion
The total number of lone pairs of electrons in melamine is **6**.

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