  The structural property of liquid cesium is investigated in the temperature
range 900 K to 1900 K by application of semiempirical effective Lennard-Jones
(8.5-4) pair potential function and employing Gillan s algorithm to solve
Percus-Yevick equation. The potential function has been derived accurately by
application of cohesive energy density in a wide range of
pressure-density-temperature () data including data at the proximity of
absolute zero temperature. The method is very much responsive to the liquid
dynamics and leads to indication of three distinct ranges of metal, nonmetal,
and metal-nonmetal transition states. The resulted pair correlation functions
are well compared with the reported experimental and first-principle molecular
dynamic. The calculated coordination numbers in the liquid range are in
agreement with experiment particularly at low temperatures, though it is
singular at about 1400 K. This observation is similar to the change from one
liquid structure to another one and is verified by heights of the first peak of
experimental pair correlation function as a function of temperatures. At T=973
K, the position of the first peak (r=7.27 A) is in agreement well with
experimental (r=5.31 A) and with the first-principle DFT molecular dynamics
(r=5.24 A).
