Why common salt `(NaCl)` sometimes appear yellow?

Explanation

To understand why common salt (NaCl) sometimes appears yellow, we can break down the explanation into several steps:

### Step 1: Understanding the Structure of NaCl
Sodium chloride (NaCl) forms a crystal lattice structure composed of sodium ions (Na⁺) and chloride ions (Cl⁻). In this structure, each sodium ion is surrounded by six chloride ions and vice versa.

**Hint:** Remember that NaCl has a regular arrangement of cations and anions in its crystal lattice.

### Step 2: Heating NaCl in the Presence of Sodium Vapor
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