PART A

Which of them are symmetric in the exchange of electrons 1 and 2?

PART B

Which of them are antisymmetric in the exchange of electrons 1 and 2?

PART C

Which of them are neither symmetric nor antisymmetric in the exchange of electrons 1 and 2?

The functions under consideration are: a. [1s (1)2s(2) +2s (1)1s(2)] [a(1)B(2) - B(1)a(2)] b. [18(1)2s(2) +28 (1)1s(2)] a (1)a(2) c. [1s (1)2s(2) +2s (1)1s(2)] [a(1)B(2) + B(1)a(2)] d. [18(1)2s(2)2s(1)1s(2)] [a(1)8(2) +B(1)a(2)] e. [18(1) 28 (2) +28 (1)1s(2)] [a(1)(2)-3(1)a(2)+a(1)a(2)] X