Question

What is Aufbau principle? What are ( n + l ) rules?

Answer 1

Answer:

. according to aufbau principle in the ground state of an atom the electron occupy the lowest energy orbital available to them that is the orbitals are filled in order of increasing value of n + l

Explanation:

n + l rule l is azimuthal quantum number and n is a Principal Quantum Number So for the orbital having the same value of n + l the orbital having lowest value of n is filled up first