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Which sequence correctly represents the ionization energies of carbon, nitrogen, and oxygen atoms?

1. C > N > O
2. C > N < O
3. C < N > O
4. C < N < O

Correct answer: C < N > O

Solution

The correct sequence reflects the increasing ionization energy trend across the second period of the periodic table, where carbon has the lowest ionization energy, nitrogen has a higher ionization energy due to its half-filled p subshell, and oxygen has a slightly lower ionization energy than nitrogen due to electron-electron repulsion in its p orbitals.

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