71. Consider the following two-electron spin-orbitals. In column (a), check the boxes for all spin- orbitals that satisfy the fundamental indistinguishablety principle for quantum particles. In column (b), check the boxes for all spin-orbitals that satisfy the fermionic nature of electrons. In column (c), check only one box indicating the correct spin-orbital describing the singlet state ( 'S) that arises from the He: 1s' 2s' excited electron configuration. No justifications required. (a) (b) (c) Check all Check all Check one correct correct only 1s(1)2s(2)a(1)a(2) 0 0 1s(1)2s(2)a(1)B(2) U 1s(1)2s(2)B(1)B(2) 0 0 1s(1)2s(2) [a(1)B(2) + B(1)a(2)] 0 0 0 1s(1)2s(2) - [a(1)B(2) - B(1)a(2)] 0 0 [1s(1)2s(2) + 2s(1)1s(2)] - [a(1)B(2) + B(1)a(2)] 0 [1s(1)2s(2) + 2s(1)1s(2)]+ [a(1)B(2) - B(1)a(2)] 0 [1s(1)2s(2) - 2s(1)1s(2)]= [a(1)B(2) + B(1)a(2)] 0 0 0 [1s(1)2s(2) - 2s(1)1s(2)] [a(1)B(2) - B(1)a(2)] 0 0