1) Aufbau's principle: Aufbau's principle states that electron occupies the orbital having the least energy.
2) Pauli's exclusion principle: Pauli's exclusion principle states that no two electrons will have all the four quantum numbers same.
3) Hund's rule: Hund's rule states that electron pairing takes place only after all the available degenerate orbitals are occupied by one electron each.
4) Octet configuration: The filling up of valence orbital with 8 electrons is referred to
as 'octet configuration'.
5) Mendeleef's periodic law: Mendeleef's periodic law states that the properties of elements are the periodic functions of their atomic weights.
6) Modern periodic law: Modern periodic law states that 'The properties of elements are
periodic functions of their atomic numbers'.
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