Question

Which section of the table will represent the element with the smallest first ionization potential?

• A. A
• B. B
• C. C
• D. D
• E. E

Answer 1

The correct option is B B

The element ($B$) belongs to group I of the periodic table. It is an alkali metal.
Group I has one electron in the outer shell. It requires minimum energy to remove the most loosely bound electron from the valence shell. Since element ($B$) is the largest size atom (with the maximum number of electron shells) in the group I so it has the smallest first ionization potential.