Chromium 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.
C 3093 (OTTOKEMI) Chromium sputtering target, 200 mm x 125 mm x 3 mm with indium bonded 0.2 mm copper backing plate thickness 2 mm, 99.99% - used in chemical research.