Is the atomic metal vapor a dielectric state?

We propose a simple method for calculating the metal vapor conductivity at the critical point and near-critical isotherms This method is based on the hypothesis of an electron jellium's existence as an origin of the conduction band in metal vapor's gaseous phase. The hypothesis was suggested in our previous works, mentioned further in this article. Satisfactory agreement with the experimental data for alkali metals (Cs, Rb) allows us to conclude that, at the critical point and its vicinity, the atomic metal vapors should be considered as a gaseous metal, that is not a dielectric state of matter. (paper)