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Which occupancy outcome manifests when degenerate atomic orbitals experience crystal field splitting?

A)Hund's rule dominates subshell filling
B)Lifshitz transition alters Fermi surface
C)Electron pairing lowers total energy
D)Metallic bonding enhances orbital overlap

💡 Explanation

Electron pairing lowers the total energy, because crystal field splitting modifies orbital energies, causing the electrons to occupy lower energy orbitals via the Hund's rule exception rather than singly occupying all orbitals. Therefore pairing occurs, rather than maximizing spin multiplicity in isolated atoms.

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