Data and interpretation are presented for inelastic electron scattering in the quasielastic region from nine target nuclei ranging from lithium to lead at an incident energy of 500 MeV and a scattering angle of 60\ifmmode^\circ\else\textdegree\fi{}. The average kinetic and separation energies of nucleons in these nuclei are deduced. Results of and comments on the radiative correction procedures used in the data analysis are also discussed.[NUCLEAR REACTIONS $^{6}\mathrm{Li}(e,{e}^{\ensuremath{'}})$, $^{12}\mathrm{C}(e,{e}^{\ensuremath{'}})$, $^{24}\mathrm{Mg}(e,{e}^{\ensuremath{'}})$, $^{40}\mathrm{Ca}(e,{e}^{\ensuremath{'}})$, $^{58.7}\mathrm{Ni}(e,{e}^{\ensuremath{'}})$, $^{89}\mathrm{Y}(e,{e}^{\ensuremath{'}})$, $^{118.7}\mathrm{Sn}(e,{e}^{\ensuremath{'}})$, $^{181}\mathrm{Ta}(e,{e}^{\ensuremath{'}})$, $^{208}\mathrm{Pb}(e,{e}^{\ensuremath{'}})$, $E=500$ MeV, $\ensuremath{\theta}={60}^{\ensuremath{\circ}}$; measured $\ensuremath{\sigma}(E)$; deduced nucleon separation and kinetic energies in Fermi gas model.]