Chapter 2, Problem 2.18P

Determine the Coulombic and exchange energies for the following states, and determinewhich state is favored (has lower energy):
a. $\underset{\_}{\uparrow }\underset{\_}{\uparrow }$ and $\underset{\_}{\uparrow \downarrow }\underset{\_}{}$
b. $\underset{\_}{\uparrow }\underset{\_}{\uparrow }\underset{\_}{\uparrow }$ and $\underset{\_}{\uparrow \downarrow }\underset{\_}{\uparrow }\underset{\_}{}$