You must be at least 16 years of age in order to attend! The Navy League of the United States is proud to host the U.S. Navyâs official 241st Birthday Ball in the National Capital Region. The ball will be held at the Gaylord National Resort & Convention Center, in National Harbor, MD.
For other uses, see Chromium (disambiguation). 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.
Hexavalent chromium is also one of the substances whose use is restricted by the European Restriction of Hazardous Substances Directive. The LD50 for chromium(VI) ranges between 50 and 150 mg/kg.In the body, chromium(VI) is reduced by several mechanisms to chromium(III) already in the blood before it enters the cells.The chromium(III) is excreted from the body, whereas the chromate ion is transferred into the cell by a transport mechanism, one by which sulfate and phosphate ions also enter the cell.The acute toxicity of chromium(VI) is due to its strong oxidative properties.exavalent chromium is also one of the substances whose use is restricted by the European Restriction of Hazardous Substances Directive. The LD50 for chromium(VI) ranges between 50 and 150 mg/kg.