Question

What is aufbau principles

Answer 1

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The aufbau principle 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 shell is filled before the 2s subshell is occupied. ... Aufbau is a German noun that means construction or "building-up".

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Answer 2

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Aufbau principle

Aufbau is a German word which means building up or construction

Statement : In the building up of atoms the electrons enters into the various orbitals in the increasing order of the their energies

The orbital with the lower energy is filled up first followed by the orbitals of higher energy