Answer:
2
Explanation:
The Pauli Exclusion Principle states that two electrons cannot have the same set of quantum numbers. From the information we have been given, three of the four quantum numbers have already been defined for the electron setting the fourth one to be arbitrary. Therefore, we need to find distinct values for the fourth quantum number (called the spin quantum number) which still complies with the previously stated properties of the electron. For an electron, that value could either be -1/2 or 1/2.
This shows that two electrons can have the same three stated quantum numbers with a variation in their spin quantum number as not to break Pauli's Exclusion Principle.
