Which of the following principles/rules limits the maximum number of electrons in an orbital to two

Which of the following principles/rules limits the maximum number of e

1.	Which of the following principles/rules limits the maximum number of electrons in an orbital to two
Answer» Aufbau's principle pauli's exclusion principle HUND's RULE of maximum multiplicity Heisenberg uncertainty principle SOLUTION :No two electrons in an atom can have IDENTICAL set of all the four quantum NUMBERS.