- no two electrons in the atom will share the same four quantum numbers n,l,m and s .
- electrons will first occupy orbitals of the lowest energy level.
- electrons will fill an orbital with the same spin number until the orbital is filled before it will begin to fill of the opposite spin number.
- electrons will fill orbitals by the sum of the quantum numbers n and l . Orbitals with equal values of(n+l) will fill with the lower n values first.
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