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Question: Answered & Verified by Expert
Among the second-period elements, the actual ionisation enthalpies are in the order Li < B < Be < C < O < N < F < Ne Which of the following options explains why Oxygen has lower ∆iH than N and F?
ChemistryClassification of Elements and Periodicity in PropertiesNEET
Options:
  • A because Oxygen has more protons in its nucleus than N and F.
  • B because Oxygen has a larger atomic size compared to N and F.
  • C because Oxygen has a half-filled p-subshell, which makes it easier to remove an electron
  • D because Nitrogen has a half-filled stable electronic configuration and Fluorine has a higher Zeffas well as smaller size
Solution:
2632 Upvotes Verified Answer
The correct answer is: because Nitrogen has a half-filled stable electronic configuration and Fluorine has a higher Zeffas well as smaller size
Correct Option is : (D)
because Nitrogen has a half-filled stable electronic configuration and Fluorine has a higher Zeffas well as smaller size

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