THE HELIUM ATOM
In previous sections, the basis for applying quantum mechanical principles has been illustrated.
Although it is possible to solve exactly several types of problems, it should not be inferred that this
is always the case. For example, it is easy to formulate wave equations for numerous systems, but
generally they cannot be solved exactly. Consider the case of the helium atom, which is illustrated in
Figure 2.7 to show the coordinates of the parts of the system.