Solution to 2001 Problem 82

The triplet spin states are the symmetric two-electron spin states (the singlet state is the antisymmetric two-electron spin state). Only I and III are antisymmetric, therefore, these are two of the valid spin eigenfunctions for a triplet state of a two-electron atom. II is the spin eigenfunction for singlet state of a two-electron atom. Therefore, answer (D) is correct.

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