However, certain conclusions can be drawn from Figure \(\PageIndex{7}\). The noble gases possess very high ionization energies because of their full valence shells as indicated in the graph. Catalytic properties [ edit] Many of the noble metals can act as catalysts. Melting point temperature of most common engineering metals are: Tungsten (W) is a metal with the highest melting point, at 3410 C (6170 F). WebThe melting point is the highest temperature at which crystallization may occur. The ionization energy of the elements within a group generally decreases from top to bottom. Refining