Question

this rule states that there can be a maximum of two electrons per orbital with opposite spins
54
hisenbergs uncertainty
paulis exclusion principle
aufbaus principle
hunds rule

Explanation:

Pauli's Exclusion Principle states that no two electrons in an atom can have the same set of quantum numbers. This means that each orbital can hold a maximum of two electrons with opposite spins. Hisenberg's Uncertainty Principle is about the inability to precisely know both the position and momentum of a particle simultaneously. Aufbau's Principle is about filling orbitals in order of increasing energy. Hund's Rule is about electrons filling degenerate orbitals singly before pairing up.

Answer:

Pauli's Exclusion Principle