Explain the Aufbau principle with suitable electronic configuration examples

Aufbau Principle:

• The Aufbau principle states that electrons occupy the lowest energy orbitals first, and then successively fill higher energy orbitals.
• This principle is used to predict the electronic configuration of an element.
• Electrons are filled into orbitals in order of increasing energy until all electrons are accounted for.
• For example, the electronic configuration of helium is 1s2, which means that the first two electrons occupy the 1s orbital.
• The Aufbau principle is based on the idea that electrons will occupy the lowest energy available to them.