Question

Two electrons in the 1s orbital must have different spin quantum numbers to satisfy.

Answer 1

The electron pair in the 1s orbital satisfies the exclusion principle because they have opposite spins, or spin quantum numbers that are +1/2 and -1/2, which are different from each other. Compared to electrons in the 1s orbital, those in the 2s level have a different quantum number.

How does the Pauli exclusion principle work?

According to Pauli's Exclusion Principle, no two electrons in the same atom can have values for all four of their quantum numbers that are exactly the same, put  alternatively. There can never be more than two electrons in a single orbital, and they must also have opposing spins.

What is the Pauli exclusion principle, exactly, and how does it work?

According to the Pauli exclusion, no two electrons can have the exact same set of quantum numbers.

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