Question

State and explain aufbau principle and paulis excusion principle

Answer 1

according to aufbau principle all electrons are arranged in energy level shells and their energy increases with increasing number of shells .

Answer 2

The aufbau principle, from the German Aufbauprinzip (building-up principle), 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......

Pauli Exclusion Principle. The Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same four electronic quantum numbers. As an orbital can contain a maximum of only two electrons, the two electrons must have opposing spins......