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For the investigation of the free energy of metals and their temperature dependence in solid and liquid phases the pseudopotential method is used. I n calculating the free energy in a solid phase the lattice vibration contribution is considered. In definition of the pair potential in liquid metals the volume change of the metal during its melting is taken into account. The structure of liquid metals is calculated with the help of the found potential using the integral equation method. The solutions of different equations for the radial distribution function are compared and the influence of the model form factor and the method of screening in the electron gas on the liquid metal structure is discussed. MeTon nCeBnOnOTeHqHaJIa IlpHMeHReTCH