Question

Explain Aufbau principle ?​

Answer 1

Answer:

In the ground state of the atom, the orbitals are filled in order of their increasing energies. electron first occupy the lowest energy orbital available to them and enter into higher energy orbitals only when the lower energy orbitals are filled.

they are as follows,

1s, 2s,2p,3s,3p,4s,3d,4p,5s,4d,5p,6s.......

Answer 2

The aufbau principle, from the German Aufbauprinzip (building-up principle), 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.