Question

The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is:-

• A. C > N > O > F
• B. O > N > F > C
• C. O > F > N > C
• D. F > O > N > C.

Answer 1

The correct option is C

O > F > N > C

Second ionization potential of oxygen is more than that for fluorine, because second electron is removed from half-filled 2p-orbital of O⁺. So, the correct order of second ionization potential is O > F > N > C.