Pauli and his irritating electron

Niels Bohr’s atomic model was the basis of the following theories. The problem of why electrons have fixed orbits led to the discovery of Schrödinger’s wave function. This time, another problem of why electrons stay in their orbits rather than fall to lower energy levels led to Pauli, the Austrian genius, discovering the Pauli’s exclusion principle. Even a talented physicist like him got irritated over the Anomalous Zeeman effect, which holds the secret of a missing quantum number. We are still a step away from cracking the whole puzzle.