(a) Estimate the repulsive energy between helium's electrons. Do this by comparing the energy required to remove the first electron, 24.6 eV (see Figure 8.16), then the second from the remaining hydrogenlike atom, to the energy required to remove both if there were no repulsion—that is, if both electrons behaved simply as though in a hydrogenlike atom, (b) How far apart would two electrons have to be to produce such a repulsive energy? (c) How does this distance compare with the approximate orbit radius in the Z = 2 hydrogenlike atom?
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