Quantum Numbers
The ground state electronic configuration of nitrogen (Z=7) according to Hund's rule is:
Select the correct option:
Solution
1s2 2s2 2p3 (three unpaired in separate 2p orbitals)
- Total Electrons: Z=7 (Nitrogen).
- Aufbau Order: 1s22s22p3.
- Hund's Rule of Maximum Multiplicity: For degenerate orbitals (like 2px,2py,2pz), electrons occupy separate orbitals singly before pairing starts.
- Mechanism: Electron-electron repulsion is minimized if electrons reside in different orbitals with parallel spins.
- Configuration: Nitrogen's three 2p electrons go into 2px1,2py1,2pz1.
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About This Question
- Subject
- chemistry
- Chapter
- atomic structure
- Topic
- quantum numbers
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
1s2 2s2 2p3 (three unpaired in separate 2p orbitals)
- Total Electrons: Z=7 (Nitrogen).
- Aufbau Order: 1s22s22p3.
- Hund's Rule of Maximum Multiplicity: For degenerate orbitals (like 2px,2py,2pz), electrons occupy separate orbitals singly before pairing starts.
- Mechanism: Electron-electron repulsion is minimized if electrons reside in different orbitals with parallel spins.
- Configuration: Nitrogen's three 2p electrons go into 2px1,2py1,2pz1.
This easy difficulty chemistry question is from the chapter atomic structure, covering the topic of quantum numbers. It appeared in the 2025 exam.
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