Sodium catches fire easily and chlorine is a harmful gas. But sodium chloride is indispensable in our daily meal. Give reasons.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Individual Elements:**
- Sodium (Na) is a highly reactive metal that can catch fire easily when it comes into contact with moisture or air. This reactivity is due to its single electron in the outer shell, which it readily loses to achieve a stable electronic configuration.
- Chlorine (Cl) is a diatomic gas (Cl2) that is toxic and harmful to humans. It is a strong oxidizing agent and can cause respiratory issues and other health problems.

2. **Formation of Sodium Chloride (NaCl):**
- When sodium and chlorine react, they form sodium chloride (NaCl), commonly known as table salt. This reaction can be represented as:
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