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The theory that all orbits of a given degenerate set must be singly occupied before pairing is known as Hund's Rule. It states that electrons will fill degenerate orbitals (orbitals of the same energy level) singly and with parallel spins before any orbital is doubly occupied. This minimizes electron-electron repulsion and stabilizes the atom. Hund's Rule is crucial in understanding the electron configuration of atoms in quantum chemistry.

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