Question

what is afbau principle​

Answer 1

Answer:-

Aufbau Principle: lower energy orbitals fill before higher energy orbitals.

Answer 2

Answer:-

The Aufbau principle, simply put, means electrons are added to orbitals as protons are added to an atom. The term comes from the German word "aufbau", which means "built up" or "construction". Lower electron orbitals fill before higher orbitals do, "building up" the electron shell.