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The Exclusion Principle
He wanted to think his way into the heart of the atom. That's what he did, and he did it brilliantly. He said that he could account for those spectral lines that were a puzzle if this is the key thing. The electron didn't just have the... What we call three quantum numbers that specified the state of the electron. But if the electron had that outer electron, the valence electron, had what he called a two-valuedness. Now, from modern perspective, as we're going to hear, that was a puzzle.