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The concept of "basic chemical models" is introduced, which is new from the standpoint of the physics of nonideal atomic plasma. This concept is based on the requirement of full correspondence of the free energy of the chemical model (free electrons, ions and atoms) of plasma to the results of exact asymptotic expansions obtained in the grand canonical ensemble for the physical model (base electrons and nuclei) of plasma. The thermodynamic functions and equations of state and ionization equilibrium are obtained for three basic chemical models differing from one another by the choice of the atomic partition function. Comparison is made with the experimental results for a nonideal plasma of cesium and inert gases. It is demonstrated that the best fit to experiment is shown by the results obtained within a basic chemical model with atomic partition function in the nearest neighbor approximation with classical determination of the size of excited atom.

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