Hund's Rule
The correct electronic configuration of nitrogen (Z = 7) in its ground state, following Hund's rule, is:
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About This Question
- Subject
- chemistry
- Chapter
- atomic structure
- Topic
- hund's rule
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
1s² 2s² 2p³ (↑ ↑ ↑)
Hund's Rule of Maximum Multiplicity states that for degenerate orbitals (orbitals with same energy like px,py,pz), pairing of electrons does not occur until each orbital is singly occupied.
- Nitrogen (Z=7) as per Aufbau: 1s22s22p3
- For the 2p subshell, the 3 electrons are placed in 2px,2py, and 2pz singly instead of pairing up.
- This configuration (↑,↑,↑) minimizes electron-electron repulsion and maximizes exchange energy stability.
This easy difficulty chemistry question is from the chapter atomic structure, covering the topic of hund's rule. It appeared in the 2025 exam.
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