Question:
Correct increasing order of first ionization enthalpy is: C, O, N, F
Correct increasing order of first ionization enthalpy is: C, O, N, F
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Half-filled orbitals are extra stable → higher ionization energy.
Updated On: Jun 10, 2026
- C < N < O < F
- C < O < N < F
- O < C < N < F
- C < O < F < N
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The Correct Option is B
Solution and Explanation
Concept:
Ionization enthalpy generally increases across a period due to increasing effective nuclear charge.
Step 1: Period trend C < N < O < F (expected trend)
Step 2: Exception (N and O) Nitrogen has half-filled stability (2p^3), so it has higher ionization energy than oxygen.
Final order C < O < N < F
Step 1: Period trend C < N < O < F (expected trend)
Step 2: Exception (N and O) Nitrogen has half-filled stability (2p^3), so it has higher ionization energy than oxygen.
Final order C < O < N < F
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