Question

1. Describe the 3 rules that govern the building of an electron configuration. Provide an example that

Answer 1

Aufbau Principle

Pauli exclusion principle

Hund's rule of maximum multiplicity

Explanation:

Aufbau's principle states that sublevels with lower energies are filled up before those with higher energies.

For example the order of filling of the orbitals are :

     1s 2s 2p 3s 3p 4s 3d 4p

Pauli exclusion principle states that no two electrons in an atom can have the same set of the four quantum numbers. This implies that no two electrons can spin the same way.

Hund's rule of maximum multiplicity states that electrons go into degenerate orbitals of sub-levels singly before pairing commences:

 

  For example in Lithium 1s² 2s¹ all the rules are obeyed.

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