Answer:
Two electrons may occupy the same electron orbital
Step-by-step explanation:
Pauli exclusion principle states that two fermions cannot occupy the same quantum state within the same system at the same time. This means that, in the case of electrons, it is impossible for two electrons in the same atom to have the same four values for quantum numbers. If two electrons reside in the same orbital, then their main quantum number, angular momentum quantum number and magnetic quantum number are the same, therefore their spin quantum number must be different.