#24 ChromiumChromium is a chemical element with symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point. Atomic mass:51.9961 amu Melting point:1857.0 C (2130.15 K, 3374.6 F) Boiling point:2672.0 C (2945.15 K, 4841.6 F) Density:293 K: 7.19 g/cm3 |