Question

"No two electrons in an atom can have all the four quantum numbers identical." This statement is of

(A) Hund's rule

(B) Aufbau principle

(C) Uncertainty principle

(D) Pauli's exclusion principle

Answer 1

Correct option is (D) Pauli's exclusion principle

Pauli's exclusion principle states that, "No two electrons in an atom can have all the four quantum numbers identical."

As an orbital can contain a maximum of only two electrons, the two electrons must have opposing spins.