The ionization energy of boron is less than that of beryllium because:

Options

A. Boron has higher nuclear charge
B. Atomic size of boron is more than that of beryllium
C. Boron has only one electron in p-sub-shell
D. Atomic size of boron is less than that of beryllium

Answer

C

Explanation

Boron has one `e^(-)` its outer orbital hence have tendency to donate the `e^(-)` easily.
`B = 1s^2, 2s^2 2p^1`
`Be = 1s^2 2s^2` (All orbital are filled)