Question

define aufbau principal,hund's rule of maximum multiplicity , Pauli's exclusion principal​

Answer 1

Answer:

Aufbau Principle-

Aufbau is a German word which means building up.

lt states that in ground state of atoms, electron first enters in the lowest energy level.

Hund's Rule of maximum Multiplicity-

According to this rule, electron pairing will not take place in orbitals of same subshell until each orbital is singly filled.

Pauli's Exclusion Principle-

It states that orbitals can accommodate maximum of 2 electrons and these must have opposite spins. This principle can also be stated as:

No 2 electrons in an atom can have same values for all the 4 quantum numbers.

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