In Melamine the total number of N- atoms having `sp^(2)` hybridisation are?

Answer

To determine the total number of nitrogen atoms having sp² hybridization in melamine, we will follow these steps:

### Step 1: Understand the Structure of Melamine
Melamine is a compound with the formula C₃H₆N₆. It has a triazine ring structure, which consists of alternating carbon and nitrogen atoms. The structure can be represented as follows:

```
N
/ \
C N
/ \ / \
N C N
/ \
H H
```

### Step 2: Identify the Nitrogen Atoms
In the structure of melamine, there are a total of 6 nitrogen atoms.

### Step 3: Determine the Hybridization of Each Nitrogen Atom
To find the hybridization of each nitrogen atom, we will use the formula:
\[ \text{Hybridization} = \frac{\text{Valence Electrons} + \text{Monovalent Bonds} - \text{Cationic Charge} + \text{Anionic Charge}}{2} \]

#### For Nitrogen Atoms in Melamine:
1. **For the three nitrogen atoms in the ring (connected to carbon):**
- Each nitrogen has 5 valence electrons.
- Each nitrogen forms one bond with carbon (monovalent bond = 1).
- There are no cationic or anionic charges.
- Calculation:
\[ \text{Hybridization} = \frac{5 + 1 + 0 - 0}{2} = \frac{6}{2} = 3 \quad \text{(sp² hybridized)} \]
Thus, these three nitrogen atoms are sp² hybridized.

2. **For the other three nitrogen atoms (NH₂ groups):**
- Each nitrogen has 5 valence electrons.
- Each nitrogen forms two bonds (one with hydrogen and one with carbon) (monovalent bonds = 2).
- There are no cationic or anionic charges.
- Calculation:
\[ \text{Hybridization} = \frac{5 + 2 + 0 - 0}{2} = \frac{7}{2} = 3.5 \quad \text{(sp³ hybridized)} \]
Thus, these three nitrogen atoms are sp³ hybridized.

### Step 4: Count the Total Number of sp² Hybridized Nitrogen Atoms
From the analysis, we find that there are **3 nitrogen atoms** that are sp² hybridized in melamine.

### Final Answer
The total number of nitrogen atoms having sp² hybridization in melamine is **3**.

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