Question:
The element with the highest first ionization energy among the following is:
The element with the highest first ionization energy among the following is:
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Remember the anomaly caused by the half filled 2p subshell of nitrogen.
Updated On: Jul 3, 2026
- B
- C
- N
- O
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The Correct Option is C
Solution and Explanation
Step 1: General trend B<C<N<O<F<Ne, but N has half-filled 2p3, extra stable.
Step 2: O's 2p4 has paired e-, easier removal despite more protons.
Step 3: Order: B(801)<C(1086)<O(1314)<N(1402).
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