Explain, why is sodium less reactive than potassium ?

Explanation

To explain why sodium (Na) is less reactive than potassium (K), we can follow these steps:

### Step 1: Identify the Group and Period
- Sodium (Na) and potassium (K) are both alkali metals and belong to Group 1 of the periodic table.
- Sodium is located in the second period, while potassium is in the third period.

### Step 2: Understand Atomic Structure
- Sodium has two electron shells: K (1st shell) and L (2nd shell).
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