Question

Observe the following statements:
Statement A: In general, the ionization potential value decreases on moving down in a group.
Statement B: The first ionization potential of sodium is greater than that of potassium.

• A. Both A and B are wrong
• B. Both A and B are correct
• C. A is correct but B is wrong
• D. A is wrong but B is correct

Hint:

Ionization energy generally decreases down a group because atomic size and shielding effect increase. In Group 1: \[ Li \gt Na \gt K \gt Rb \gt Cs \] with respect to first ionization energy.

Answer 1

The Correct Option is B

Step 1: Evaluate Statement A.
Going down a group, atomic radius increases and shielding increases, so the outermost electron is more loosely held. Ionization potential (IP) decreases down a group. Statement A is correct.

Step 2: Evaluate Statement B.
Na (Period 3) lies above K (Period 4) in Group 1. Since IP decreases down a group, IP(Na) > IP(K). Statement B is correct. \[ oxed{ ext{Both A and B are correct}} \]