Ionic bonding is seen in

Options

A. Methane
B. Hydrogen
C. Ammonia
D. Sodium oxide

Explanation

To determine where ionic bonding is seen, we need to analyze the options provided in the question. Ionic bonding typically occurs between metals and non-metals. Let's go through the reasoning step by step.

### Step-by-Step Solution:

1. **Understanding Ionic Bonding**:
- Ionic bonding occurs when there is a transfer of electrons from a metal to a non-metal. The metal loses electrons to form a positively charged ion (cation), while the non-metal gains electrons to form a negatively charged ion (anion).

2. **Identifying the Elements**:
- We need to look at the given options and identify whether they consist of a metal and a non-metal.

3. **Analyzing the Options**:
- **Option 1: Methane (CH₄)**:
- Both carbon (C) and hydrogen (H) are non-metals. Therefore, they form covalent bonds by sharing electrons, not ionic bonds.
- **Conclusion**: Not ionic.

- **Option 2: Hydrogen (H₂)**:
- Hydrogen is a non-metal, and since both atoms are the same, they will also form a covalent bond.
- **Conclusion**: Not ionic.

- **Option 3: Ammonia (NH₃)**:
- Nitrogen (N) and hydrogen (H) are both non-metals. They share electrons to form covalent bonds.
- **Conclusion**: Not ionic.

- **Option 4: Sodium Oxide (Na₂O)**:
- Sodium (Na) is a metal, and oxygen (O) is a non-metal. Sodium will lose electrons to form Na⁺ ions, and oxygen will gain electrons to form O²⁻ ions.
- The attraction between Na⁺ and O²⁻ forms an ionic bond.
- **Conclusion**: This is ionic.

4. **Final Answer**:
- Ionic bonding is seen in **Sodium Oxide (Na₂O)**.