Question

what is auf bau principle and state its importance ​

Answer 1

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.

Answer 2

Explanation:

The Aufbau principle dictates the manner in which electrons are filled in the atomic orbitals of an atom in its ground state. ... It is important to note that each orbital can hold a maximum of two electrons (as per the Pauli exclusion principle).