<p>The article presents the results of assessing the fulfillment of the periodicity of the emissivity of metals of the fourth period of the periodic table in the region of melting temperatures. The calculations used experimental arrays of numerical values of the emissivity of metals obtained personally by the authors and materials from open sources. An example of the relationship between the melting point of a metal and the magnitude of the relative jump in the emissivity of the solid–liquid phase transition is considered. A comparison of the relative jump in the emissivity of the phase transition to the atomic number in the periodic table is carried out. The obtained isotherms of the thermal dependences of the averaged temperatures of the experimental data to the atomic number of the element in the periodic table are analyzed. A stable correlation is established between the emissivity, melting point, and the position of the element in the periodic table. A conclusion is made about a complex structural dependence of the periodicity of the relative jump in emissivity on the melting temperature, and the mechanisms of disordering of the crystal lattice of metals during the transition from the solid to the liquid state are discussed. Common features in the behavior of thermophysical characteristics of metals of the fourth period of the periodic table have been identified.</p>