which rule describes that electrons occupying the same orbital must have opposite spin? a. Aufbaus principle b. Paulus exclusion principle c. Hinds rule d. none of the above​

b. Paul's exclusion principle

Explanation:

Let's go through the definition f each of the options and eliminate the wrong answers;

a. Aufbau's principle

This principle states that electrons fill the lower energy orbitals first before moving o higher energy orbitals. This option is wrong.

b. Paul's exclusion principle

This states that no two electrons can have the same four quantum numbers. It can also be stated that; If two electrons occupy the same orbital, they must have opposite spins. This option is correct.

c. Hund's rule

This rule states that every orbital in a sub level is singly occupied before being double occupied. This option is wrong.

d.none of the above​

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