Chromium

Chromium The following report I have put together is on Chromium. The question you might be asking yourself, is what exactly is chromium? Well, Chromium is a hard, polished gray metal. When at room temperature, it is a solid. The atomic number of Chromium is 24 and is in group six on the periodic table which makes it a transitional metal. In the following report, I will cover the discovery of the element and the many uses of of it. Properties of chromium The physical properties of Chromium

Chromium, the seventh most abundant element on earth is a transition metal from group VI-B .It is found in nature as the bound form constituting approximately 0.1 – 0.3 mg.g-1 of the earth’s crust. The name of the element is derived from the Greek word "chroma" meaning color, because many of its compounds are intensely colored. Cr is able to exist in several oxidation states, of which the trivalent Cr (III) and hexavalent Cr (VI) species are the most stable and abundant forms (Zayed & Terry et

Chromium has an atomic number of 24, and is considered to be a transition metal. It has an atomic mass of 51.996 amu, a melting point of 1907 degrees Celsius (2180 K, 3465 degrees Fahrenheit), and a boiling point of 2671 degrees Celsius (2944 K, 4840 degrees Fahrenheit). This element is the first element within group 6. The ways in which interactions with light occur along its surface allow for it to be considered lustrous. In addition, it is a silvery metallic that is hard yet brittle. Its crystalline

As seen on the right, Chromium is an element one may assume that it is nothing more than a disheveled piece of shiny silver. However, it is much more than that. Have you ever wondered how shiny car fenders are manufactured or perhaps what makes them so lustrous? To your surprise, or maybe not to your surprise, they are mostly made of the element Chromium! With that said, that is not the only purpose chromium serves. It may be used to harden steel, manufacture stainless steel, or form other useful

Chromium (Cr) is a metallic element present in soils, waters, rocks, fauna and flora, and volcanic and dust gases. Although chromium is the 22nd most abundant element in the Earth’s crust with an average concentration of 100 ppm, the free metal is never found in nature. (Emsley, John (2001). "Chromium". Nature's Building Blocks: An A-Z Guide to the Elements. Oxford, England, UK: Oxford University Press. pp. 495–498.ISBN 0-19-850340-7.) (Encyclopædia Britannica Online, s. v. "chromium (Cr)", accessed

under health and safety regulations, finding an alternative plating process to the current hexavalent chromium process has become a real necessity. Trivalent chromium has proved to be a suitable replacement due to being less toxic, both health-wise and environmentally, whilst also demonstrating almost identical metal finishes to those of the hexavalent chromium deposits. However, the trivalent chromium chemical process is not without its difficulties, such as the inertness of the Cr3+ ions to be reduced

SEMINAR AND TERM PAPER ON Enhancing phytoremediation of chromium-stressed soils through plant-growth-promoting bacteria Under the guidance of: Dr. Pravindra Kumar Associate proffesor Department Of Biotechnology Indian Institute of Technology Roorkee Submitted by: Ilu Kumari M.Sc. II yr Enrollment no: - 14610008 Department Of Biotechnology Indian Institute Of

metals into the environment , effluents of these industries are mainly loaded with heavy metals ions. These heavy metals are very toxic for all living organisms even at very low concentration. Most common examples of heavy metals are Zinc, Cadmium, Chromium, Arsenic, Lead and Copper. Heavy metals are classified in three categories on the basis of nature of metal and its value and these metals have higher specific weight usually more than 5.0 g/cm3 (Bishop, 2002; Volesky, 1990; Wang & Chen, 2006). 1

Chromium is used in the body as blood glucose regulator. Chromium helps the body accept insulin into the cells; therefore, helping the body stabilize blood glucose levels. Chromium is essential for patients with diabetes or metabolic syndrome because it helps regulate insulin levels. Therefore, a chromium deficiency could be harmful to people who have insulin regulators. Deficiency is common in areas that have soil that contains low chromium amounts, such as the United States. To prevent deficiency

steel is the best type to look for. Check the bottom stamp or the label to see whether or not the product is “18/10 Stainless Steel”, which means it has a composition of 10% nickel and 18% chromium. A stainless steel product has to have at least 10.5% chromium in order for it to label itself as stainless. More chromium will add to the strength of the model, as well. Nickel helps to increase the protective layers and also adds a shine to the appliance. Pressure cookers use heavy stainless steel in order