Question

Why pauli exclusion principle is known as exclusion principle?

Answer 1

Pauli formulated the exclusion principle which states that "No two electrons in an atom can have the same way of values of all four Quantum numbers" it means that each electron must have unique values for the four Quantum numbers (n, l, m and s).

Answer 2

no two electrons in an atom can have the same set of values of all four quantum numbers