Since the physical properties of the metal, you can call it a bluish-white color, and body-centered cubic lattice.The transition temperature of chromium from the paramagnetic state to the antiferromagnetic (or to achieve a so-called Neel point), - 39 degrees Celsius.This element is also ranked as the most solid group of pure metals with the index 5 on the Mohs scale (one of the criteria adopted by the hardness), in which chromium is second only to the next "trinity" - tungsten, uranium and beryllium.In the case of being in a very pure form element is perfectly amenable to mechanical effects and processing.
It is believed that the chromium oxidation state characterized by four - two, three, four and six.The fi
rst is a black oxide CrO yellow hydroxide is a very strong reducing agent, the second - Cr2O3 - is green and gray-green hydroxide, third - CrO2 - colorless, maloharakterna and very rare, and the last, the fourth - CrO3 - has red, acidic and is a strong oxidant, hygroscopic and very poisonous.
Chrome fairly stable when exposed to air due to passivation (transition metal surface in an inactive or passive state).It is for this reason it does not react with sulfuric and nitric acids.Chromium combusted at a temperature 2000 degrees Celsius, whereupon a green oxide of formula Cr2O3 and amphoteric properties.
Modern chemists can synthesize a compound of chromium and boron (various borides - Cr2B, CrB, Cr3B4, etc.), chromium, and carbon (three types of carbides), chromium and silicon (the three silicide) and chromium with nitrogen(two nitride).
This chemical element is a nutrient and is constantly included in the composition of plant and animal tissues.Animals chromium participates in the metabolism of lipids, proteins and carbon, and its decrease in food and blood capable lead to reduced growth rate and increased concentrations of cholesterol in the blood.In its pure form, it is quite toxic, and metal chromium dust can cause severe irritation of the lung tissue.Metal compounds can also induce dermatitis, lead to many diseases (including cancer and character).Chrome is very common in the human nature, its basic compounds - chromium or chromium iron ore called the formula FeO Cr2O3 and crocoite PbCrO4.