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AP Chemistry
Hund's Rule states that electrons will occupy empty orbitals in the same sublevel before they pair up in the same orbital.
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The distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
Orbital: A region around the nucleus of an atom where there is a high probability of finding an electron.
Sublevel: An energy level defined by quantum theory. In chemistry, sublevels refer to energies associated with electrons.