  We suggest that the number of correlated nucleon pairs in an arbitrary
nucleus can be estimated by counting the number of proton-neutron,
proton-proton, and neutron-neutron pairs residing in a relative $S$ state. We
present numerical calculations of those amounts for the nuclei $^{4}$He,
$^{9}$Be, $ ^{12}$C, $ ^{27}$Al, $ ^{40}$Ca, $ ^{48}$Ca, $ ^{56}$Fe, $
^{63}$Cu, $ ^{108}$Ag, and $ ^{197}$Au. The results are used to predict the
values of the ratios of the per-nucleon electron-nucleus inelastic scattering
cross section to the deuteron in the kinematic regime where correlations
dominate.
