Chromium
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Chromium ( / ˈ k r oʊ m i ə m / KROH-mee-əm) is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odorless, tasteless, and malleable. The name of the element is derived from the Greek word "chrōma" (χρώμα), meaning colour, because many of its compounds are intensely coloured. Chromium oxide was used by the Chinese in the Qin dynasty over 2,000 years ago to coat weapons such as bronze crossbow bolts and steel swords found at the Terracotta Army. It later came to the attention of the west when it was discovered by Louis Nicolas Vauquelin in the mineral crocoite (lead(II) chromate) in 1797. Crocoite was used as a pigment, and after the discovery that the mineral chromite also contains chromium, this mineral was used to produce pigments as well. Chromium was regarded with great interest because of its high corrosion resistance and hardness. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding chromium to form stainless steel. This application, along with chrome plating (electroplating with chromium) are currently the highest-volume uses of the metal. Chromium and ferrochromium are produced from the single commercially viable ore, chromite, by silicothermic or aluminothermic reaction or by roasting and leaching processes. Although trivalent chromium (Cr(III)) is required in trace amounts for sugar and lipid metabolism, few cases have been reported where its complete removal from the diet has caused chromium deficiency. In larger amounts and different forms chromium can be toxic and carcinogenic. The most prominent example of toxic chromium is hexavalent chromium (Cr(VI)). Abandoned chromium production sites often require environmental cleanup. From Wikipedia under the
GNU Free Documentation License Nounchromium (uncountable) Chromium
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GNU Free Documentation License From Google Image Search: "chromium" 5min.com Thu, 13 Aug 2009 00:00:00 PDT Crossover Chromium - Software Review - Ubuntu Linux 8.04 tutorials, this tutorial will show you a Crossover Chromium software review.. 5min.com. live.edie.net Tue, 04 May 2010 05:04:19 PDT Dr Richard Bewley talks about chromium contamination trials in Glasgow.. live.edie.net. From Google Video Search: "chromium" How many half-filled orbitals does Chromium have? Q. I had this on my test and I said that it was 6. Everybody told me I was wrong, so I wanted to ask the people here at Yahoo Answers. BTW, Chromium has 24 electrons and an electron configuration of 2-8-13-1 I thought it would go like: 1s2 2s2 2p6 3s2 3p6 4s1 3d5 It doesn't seem to make sense why 4s would have one electron, but that's what fits the configuration.. . Hmmm on wikipedia it seems to say that it has 4s1 and then 3d5 because of "the lower energy of the high spin configuration." I guess I was right, but please make sure that the answer is indeed 6. Thanks :) Asked by Felix-Ichi-Anderson!!! - Sat Jan 31 15:55:16 2009 - Chemistry - 2 Answers - Comments A. Yes, the answer is 6. You will often see orbitals with #s1 oribals because the electron is needed for the outer, valence electron shell Answered by heywebster21 - Sat Jan 31 15:59:58 2009 What chemical properties does chromium have? and is it harmful to the environment?
Q. im doing a report on chromium and just need to know what chemical properties it has. I also need to know if it is radioactive of harmful? Asked by Kristin - Thu Apr 14 01:07:12 2011 - Chemistry - 1 Answers - Comments A. Whoever teaches information technology or computer studies at your school or college should be dismissed if they haven't taught you to do a simple web search to find what you want!!! It's so easy! try yes it is harmful to the enviroment and no, it isn't radioactive. Answered by Colin - Thu Apr 14 11:59:16 2011 From Yahoo Answer Search: "chromium" |
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