Question

Difference between aufbau principle ,pauli's exclusion and hund's principles

Answer 1

afbau princ. said that the orbitals are filled according to increasing energies.

Pauli exclusion princ. shows that electron pairing will not take place until they are singly filled.

hund rule said that the electrons filled in the orbitals have opposite spin

Answer 2

The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s subshell is filled before the 2s subshell is occupied............

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