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.
Chromium oxide was discovered in 1797 by Louis-Nicholas Vauquelin, who prepared the metal itself in the following year. Starting from crocoite the procedure was to powder the mineral and to precipitate the lead out through its reaction with hydrochloric acid (HCl in water).The residue was chromium oxide, CrO 3.Heating this oxide in an oven in the presence of charcoal as a reducing agent gave the metal itself. Vauquelin also analysed an emerald from Peru and discovered that its green colour is because of the presence of the new element, chromium.In fact, the name chromium is from the Greek word  chroma  meaning  colour , so named because of the many different coloured compounds displayed by chromium.A year or two after Vauquelin's discovery, a German chemist named Tassaert working in Paris found chromium in an ore now called chromite.hromium oxide was discovered in 1797 by Louis-Nicholas Vauquelin, who prepared the metal itself in the following year. Starting from crocoite the procedure was to powder the mineral and to precipitate the lead out through its reaction with hydrochloric acid (HCl in water). The residue was chromium oxide, CrO 3.