Which of the following orders about ionization energy is correct ?

Options

A. `N gt O gt F `
B. `N lt O lt F`
C. `N gt O lt F`
D. `N lt O gt F`

Answer

C

Explanation

In general as the nuclear charge increases from left to right in period the ionization enthalpy increases accordingly .But ionization enthalpy of N is highest than that of O due to greater stability of the exactly half- filled electronic configuration of the 2p- orbitals `(1s^(2) 2s^(2) 2p_(x)^(1) 2p_(y)^(1) )` in N atom. Therefore amongst N, O and atoms , the ionization enthalpy of O is the lowest i.e., option ( c) is correct.