It is not possible to predict the thermal expansion of liquid metals based on the number of atoms. Thermal expansion is a material property that depends on various factors such as interatomic bonding, temperature, and pressure. The thermal expansion of liquid metals is typically studied using statistical mechanics and thermodynamics, which involve the analysis of the collective behavior of a large number of atoms or molecules. Therefore, it is not possible to accurately predict the thermal expansion of liquid metals by considering only a few atoms.