An electron occupies the lowest energy orbital that can receive it *
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Aufbau Filling Principle An electron occupies the lowest orbital (energy) that can receive it. Hund's Rule states that orbitals of equal energy are each occupied by one electron before any are occupied by a second electron and all electrons in singly occupied orbitals must have the same spin.
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AufBau Principal states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy level before occupying higher-energy levels.
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