The compound which has covalent bond is

Options

A. CsCl
B. CaO
C. `N_(2)`
D. `Na_(2)O`

Answer

To determine which compound has a covalent bond, we need to analyze the bonding nature of each compound listed in the options.

### Step-by-Step Solution:

1. **Understand Covalent Bonding**:
- A covalent bond is formed when two atoms share electrons. This typically occurs between nonmetals.

2. **Analyze the Options**:
- We have four options to evaluate:
1. CsCl (Cesium Chloride)
2. CaO (Calcium Oxide)
3. N2 (Nitrogen Molecule)
4. Na2O (Sodium Oxide)

3. **Evaluate CsCl**:
- Cesium (Cs) is a metal and Chlorine (Cl) is a nonmetal.
- Cs donates one electron to Cl, resulting in the formation of ions (Cs⁺ and Cl⁻).
- This is an ionic bond, not a covalent bond.

4. **Evaluate CaO**:
- Calcium (Ca) is a metal and Oxygen (O) is a nonmetal.
- Ca donates two electrons to O, forming Ca²⁺ and O²⁻ ions.
- This is also an ionic bond, not a covalent bond.

5. **Evaluate N2**:
- Nitrogen (N) is a nonmetal and in its diatomic form (N2), each nitrogen atom shares three electrons with the other.
- This sharing of electrons results in a triple covalent bond.
- Therefore, N2 has a covalent bond.

6. **Evaluate Na2O**:
- Sodium (Na) is a metal and Oxygen (O) is a nonmetal.
- Each sodium atom donates one electron to oxygen, forming Na⁺ and O²⁻ ions.
- This results in an ionic bond, not a covalent bond.

7. **Conclusion**:
- Among the given options, only N2 has a covalent bond.

### Final Answer:
The compound which has a covalent bond is **N2 (Nitrogen Molecule)**.