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dunno The element was discovered by Louis Nicolas Vauquelin in 1797. He named it atomic number 24 after the Greek word “Chroma” meaning “ falsify” because of the some(prenominal) different colourise of its compounds. Chromium is a precise common element. It ranks, over all, about 21st in inseparable abundance among elements in crustal rocks. It’s melting point is 1,857 degrees Celsius, boil point is 2,672 degrees Celsius, and has a specific gravity of 7.2. Chromium plenty replace part of the aluminum and iron in many minerals, giving them their unique colors. Many precious stones owe their colors to chromium compounds. In chromites and chromic salts, chromium has a valence of +3.

just about of these compounds are green, but some are red or blue. Chromic oxide (Cr2O3) is a green solid. In chromates and dichromates, chromium has a valence of +6. Potassium dichromate (K2Cr2O7) is a red, water-soluble, mixed with gelatin, gives Bibliography: ...If you want to larn a full essay, order it on our website: Orderessay

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