Chromium is the sole element which exhibits antiferromagnetic ordering in its solid state at and below room temperature. Chromium gets paramagnetic above 38įC.
Stainless steel is hard and resists corrosion because of the addition of chromium.
Chromium takes place naturally as a combine of three stable isotopes. 19 radioisotopes have been characterized.
Trace sums of trivalent chromium are required for lipid and sugar metabolism. Hexavalent chromium and its compounds are really toxic. The +1, +4 and +5 oxidation states also take place, although they are less frequent.
Chromium in air is passivated through oxygen, developing a protective layer that is essentially a spinel that is several atoms thick.
Chromium is employed to prepare colors (including red, yellow and green), color rubies red, color glass green and emeralds green, in some tanning procedures, as a decorative and protective metal coating and like a catalyst.
Most chromium is acquired by mining the mineral chromite. Even though it is rare, native chromium also exists. It may be discovered in kimberlite pipe, where the decreasing atmosphere favors the development of diamond in addition to elemental chromium.
Chromium is the twenty first most abundant element in the World's crust. It is present at a concentration of around 100 ppm.
Chromium is a pretty active metal. It does not respond with water, but responds with most acids. It combines with oxygen at room temperature to make chromium oxide (Cr 2 O 3). Chromium oxide forms a thin layer on top of the metal, guarding it from additional corrosion (rusting).
The abundance of chromium in the world's crust is approximately 100 to 300 parts per million. It ranks about number 20 among the chemical elements with regards to their abundance in the earth.
Chromium does not take place as a free element. Today, almost all chromium is made from chromite or chrome iron ore (FeCr 2 O 4 ).The major producer of chromite ore is South Africa. Other essential producers are Turkey, Kazakhstan, Finland, India, Brazil and Albania. You can find no chromite mines in the USA.