Quantum Numbers

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The ground state electronic configuration of nitrogen (Z=7) according to Hund's rule is:

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1. **Total Electrons**: Z=7 (Nitrogen).
2. **Aufbau Order**: $1s^2 \, 2s^2 \, 2p^3$.
3. **Hund's Rule of Maximum Multiplicity**: For degenerate orbitals (like $2p_x, 2p_y, 2p_z$), electrons occupy separate orbitals singly before pairing starts.
4. **Mechanism**: Electron-electron repulsion is minimized if electrons reside in different orbitals with parallel spins.
5. **Configuration**: Nitrogen's three $2p$ electrons go into $2p_x^1, 2p_y^1, 2p_z^1$.

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