The size of potassium atom is greater than the size of sodium atom. Give reason.

Explanation

To explain why the size of a potassium atom is greater than that of a sodium atom, we can break down the reasoning into several steps:

### Step 1: Identify the Elements
- Sodium (Na) and potassium (K) are both alkali metals found in Group 1 of the periodic table.

### Step 2: Atomic Numbers and Electron Configurations
- Sodium has an atomic number of 11, which means it has 11 electrons. Its electron configuration is 2, 8, 1.
- Potassium has an atomic number of 19, meaning it has 19 electrons. Its electron configuration is 2, 8, 8, 1.
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