Asked by Lena
Why are electrons paired in orbits?
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Answered by
DrBob222
Quantum chemistry (quantum physics) tells us that each orbital can hold two electrons. The Pauli Exclusion Principle tells us that no two electrons in the same atom can have the same four quantum numbers; therefore, these two electrons may have the same n,l, and m<sub>l</sub> so they may NOT have the same m<sub>s</sub>. Thus we write one with m<sub>s</sub> = +1/2 and the other electrons with m<sub>s</sub> = -1/2.
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