The ionisation potential of potassium is ________ ​that of sodium. `(gt//lt)`

Explanation

To determine the relationship between the ionization potential of potassium (K) and sodium (Na), we can follow these steps:

### Step-by-Step Solution:

1. **Define Ionization Potential**:
Ionization potential (or ionization energy) is the minimum energy required to remove an electron from an isolated gaseous atom.

2. **Understand the Concept of Atomic Size**:
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