A) \[K\]
B) \[Be\]
C) \[Na\]
D) \[Mg\]
Correct Answer: B
Solution :
The ionization potential is the amount of energy required to take out the most loosely held electron from a neutral isolated atom. By increasing the atomic size the ionization potential decreases. Ionization potential \[\propto \frac{1}{atomic\text{ }size}\] Be is the smallest atom hence it has maximum ionization potential.
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