The spins of the two electrons in the ground stare of helium can be either parallel or antiparallel…

Описание: The spins of the two electrons in the ground stare of helium can be either parallel or antiparallel. The Pauli exclusion principle does not apply to antiparallel spins, but electrons with parallel spins must avoid each other. Would you expect the two possible spin arrangements to have the same energy? If not, which energy would be lower?

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