Question

what is Aufbau rule​

Answer 1

Explanation:

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

Mark me as a brainlist thankyou

Answer 2

${\huge{\bold{\orange{\underline{♡Answer-♡}}}}}$

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.