Which of the following species contains three bond pairs and two ione pair around the central atom ?

Options

A. `NH_(2)^(-)`
B. `ClF_(3)`
C. `H_(2)`O
D. `BF_(3)`

Answer

To determine which species contains three bond pairs and two lone pairs around the central atom, we can follow these steps:

### Step 1: Identify the Central Atom and Valence Electrons
We need to analyze the given species to find the central atom and count its valence electrons.

### Step 2: Analyze Each Species
1. **NH2- (Amide Ion)**:
- Nitrogen (N) is the central atom.
- Valence electrons: Nitrogen has 5 valence electrons, and the negative charge adds 1 more, giving a total of 6 electrons.
- Bonding: It forms 2 bonds with hydrogen atoms (2 bond pairs) and has 2 lone pairs.
- Conclusion: This does not satisfy the condition (3 bond pairs, 2 lone pairs).

2. **ClF3 (Chlorine Trifluoride)**:
- Chlorine (Cl) is the central atom.
- Valence electrons: Chlorine has 7 valence electrons.
- Bonding: It forms 3 bonds with fluorine atoms (3 bond pairs) and has 2 lone pairs remaining.
- Conclusion: This satisfies the condition (3 bond pairs, 2 lone pairs).

3. **H2O (Water)**:
- Oxygen (O) is the central atom.
- Valence electrons: Oxygen has 6 valence electrons.
- Bonding: It forms 2 bonds with hydrogen atoms (2 bond pairs) and has 2 lone pairs.
- Conclusion: This does not satisfy the condition (2 bond pairs, 2 lone pairs).

4. **BF3 (Boron Trifluoride)**:
- Boron (B) is the central atom.
- Valence electrons: Boron has 3 valence electrons.
- Bonding: It forms 3 bonds with fluorine atoms (3 bond pairs) and has no lone pairs.
- Conclusion: This does not satisfy the condition (3 bond pairs, 0 lone pairs).

### Step 3: Conclusion
Based on the analysis, the only species that contains three bond pairs and two lone pairs around the central atom is **ClF3**.

### Final Answer
**ClF3** contains three bond pairs and two lone pairs around the central atom.

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