Question

Sodium has, as compared to potassium :

• A. Less electronegativity
• B. More ionisation potential
• C. Larger atomic radius
• D. Lower melting point

Answer 1

Answer: (B)

More ionisation potential

Answer 2

For (1), (3) and (4) refer above question.

(4) Sodium is smaller than potassium in size. The valence shell electron is tightly bound with nucleus and therefore, more energy is required to eject out the electron. So sodium has higher ionisation energy than that of potassium.