Question

Which one of the following has maximum ionization potential?

• A. $K$
• B. $Be$
• C. $Na$
• D. $Mg$

Answer 1

Answer: (B)

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 potentialo $\frac{1}{\text{ atomic size }}$ Be is the smallest atom hence it has maximum ionization potential.