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1. Pauli Exclusion Principle - states that two electrons can occupy the same orbital only if they have opposing/opposite spins so that their magnetic fields of source attract each other.

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Answer:

same, opposite

Explanation:

Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers. In other words, (1) no more than two electrons can occupy the same orbital and (2) two electrons in the same orbital must have opposite spins (Figure 46(i) and (ii)). Figure 46.