Question

Observe the following statements:
Statement A: In general, the ionization potential value decreases on moving down in the group.
Statement B: The 1\textsuperscript{st} ionization potential of sodium is greater than that of potassium.
Correct answer is

• 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:

Remember periodic trends: Ionization energy decreases down a group.
Smaller atoms hold electrons more tightly.

Answer 1

The Correct Option is B

Ionization potential generally decreases down a group due to increasing atomic size and shielding effect. Sodium (Na) is above potassium (K) in group 1. Since Na has a smaller atomic radius and stronger nuclear attraction than K, its 1\textsuperscript{st} ionization energy is higher. Thus: \begin{itemize} \item Statement A is correct: Ionization energy decreases down the group. \item Statement B is also correct: Na has higher ionization energy than K. \end{itemize}