It is located in Group 6 and it has a melting point of 1907°c and a boiling point of 2671°c being a solid metal at room temperature. Transition metal, and chemical element with symbol Cr and atomic number 24. Common chemical compounds are also provided for many elements. Comprehensive data on the chemical element Chromium is provided on this page including scores of properties, element names in many languages, most known nuclides of Chromium. Its salts are used as a variety of pigments due to the wide range of colours formed. Chromium on periodic table of the elements. Periodic Table of Elements Element Chromium - Cr. It does this as a small layer of Chromium oxide forms on the surface preventing further reaction to oxygen. Chromium is used extensively in the production of stainless steel and other alloys due to its high shine finish and its ability to resist corrosion. Chromium draws its name from the Greek ‘Chroma’ meaning colour due to its ability to form multiple coloured compounds. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. In 1781 he managed to isolate the metal by heating the oxide sample with charcoal. Element Chromium (Cr), Group 6, Atomic Number 24, d-block, Mass 51.996. It was through his work with the mineral Crocoite that he discovered when it was heated with Potassium carbonate it produced a yellow salt. It has the symbol Cr.Ĭhromium was discovered in 1780 by the French chemist Nicolas Louis Vauquelin. It is a Transition metal and located in Group 6 of the periodic table. Chromium Metal Symbol: Cr Atomic number: 24 Atomic mass: 51. Chromite, chromium's primary ore, is used to make molds for the firing of bricks because of its high melting point, moderate thermal expansion and stable crystal structure.Įstimated Crustal Abundance: 1.Chromium (Cr) is a silver metal that has the atomic number 24 in the periodic table. Chromium compounds are also used to anodize aluminum, a process which coats aluminum with a thick, protective layer of oxide. Potassium dichromate (K 2Cr 2O 7) is used in the tanning of leather while other chromium compounds are used as mordants, materials which permanently fix dyes to fabrics. Rubies and emeralds also owe their colors to chromium compounds. Chromic oxide (Cr 2O 3), also known as chrome green, is the ninth most abundant compound in the earth's crust and is a widely used green pigment. Lead chromate (PbCrO 4), also known as chrome yellow, has been used as a yellow pigment in paints. Other chromium-steel alloys are used to make armor plate, safes, ball bearings and cutting tools.Ĭhromium forms many colorful compounds that have industrial uses. Chromium is added to steel to harden it and to form stainless steel, a steel alloy that contains at least 10% chromium. Chromium is an element number 24 from transition metals family. Chromium can be polished to form a very shiny surface and is often plated to other metals to form a protective and attractive covering.
Cr periodic table element series#
Data Series 140, Historical Statistics for Mineral and Material Commodities in the United States, Version 2011, USGS. HyperPhysics, Georgia State University, Abundance of Elements in Earths Crust.
Today, chromium is primarily obtained by heating the mineral chromite (FeCr 2O 4) in the presence of aluminum or silicon.Ĭhromium is a blue-white metal that is hard, brittle and very corrosion resistant. World Book Encyclopedia, Exploring Earth. Although he believed a method for isolating chromium didn't yet exist, Vauquelin was pleasantly surprised in 1798 to discover that he was able to obtain metallic chromium by simply heating chromium oxide in a charcoal oven. He produced chromium oxide (CrO 3) by mixing crocoite with hydrochloric acid (HCl).
Chromium was discovered by Louis-Nicholas Vauquelin while experimenting with a material known as Siberian red lead, also known as the mineral crocoite (PbCrO 4), in 1797.
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