Chromium

Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-grey, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point. The name of the element is derived from the Greek word χρῶμα, chrōma, meaning color, because many of its compounds are intensely colored.

Chromium oxide was used by the Chinese in the Qin dynasty over 2,000 years ago to coat metal weapons found with the Terracotta Army. Chromium was discovered as an element after it came to the attention of the Western world in the red crystalline mineral crocoite (lead(II) chromate), discovered in 1761 and initially used as a pigment. Louis Nicolas Vauquelin first isolated chromium metal from this mineral in 1797. Since Vauquelin's first production of metallic chromium, small amounts of native (free) chromium metal have been discovered in rare minerals, but these are not used commercially. Instead, nearly all chromium is commercially extracted from the single commercially viable ore chromite, which is iron chromium oxide (FeCr2O4). Chromite is also now the chief source of chromium for chromium pigments.

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Hexavalent chromium

Hexavalent chromium (chromium(VI), Cr(VI)) refers to chemical compounds that contain the element chromium in the +6 oxidation state. Virtually all chromium ore is processed via hexavalent chromium, specifically the salt sodium dichromate. Approximately 136,000 tonnes (300,000,000 lb) of hexavalent chromium was produced in 1985. Other hexavalent chromium compounds are chromium trioxide and various salts of chromate and dichromate. Hexavalent chromium is used in textile dyes, wood preservation, and as anti-corrosion and conversion coatings and a variety of niche uses. Chromium hexavalent compounds exist in several forms. Industrial uses of hexavalent chromium compounds include chromate pigments in dyes, paints, inks, and plastics; chromates added as anticorrosive agents to paints, primers, and other surface coatings; and chromic acid electroplated onto metal parts to provide a decorative or protective coating. Hexavalent chromium can be formed when performing "hot work" such as welding on stainless steel or melting chromium metal. In these situations the chromium is not originally hexavalent, but the high temperatures involved in the process result in oxidation that converts the chromium to a hexavalent state.(29 CFR OSHA General Industry 1910)

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Chromium (disambiguation)

Chromium is a chemical element.

Chromium may also refer to:

  • Chromium (computer graphics), a system for OpenGL rendering on clusters of computers
  • Chromium (web browser), the open source counterpart to Google Chrome
    • Chromium OS, the open source operating system counterpart to Google Chrome OS
  • Chromium OS, the open source operating system counterpart to Google Chrome OS

    • See also

  • Chromium B.S.U., an open-source space shooter game
  • Chrome (disambiguation)
  • Category:Chromium
  • All pages beginning with "Chromium"
  • All pages with titles containing Chromium
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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Chromium_(disambiguation)

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    Star to Star

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    Confessions of a Hero

    Released 2008

    Intro Spectre

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    Chromium

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    Chrome

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    PLAYLIST TIME:

    WALKING IN YOUR SHADOW

    by: Chromium

    Where were you
    When I needed
    To find a way
    Lost in life
    Wanting escape,
    Already there
    Where was I
    When I needed
    A push to stay
    Am I here
    Or lost in
    A wanted shame?
    But I know
    Here I am,
    Walking in your shadow
    But you never noticed
    Here we are, one and one together
    But it'll never find
    Where were we
    When we needed
    Some piece of mind
    But I know
    Here I am,
    Walking in your shadow
    But you never noticed
    Here we are, one and one together
    But it'll never find
    You'll miss it when it's gone
    You'll miss it when it's gone
    You'll miss it when it's gone
    Here I am,
    Walking in your shadow
    But you never noticed
    Here we are, one and one together
    But it'll never find
    You'll miss it when it's gone
    You'll miss it when it's gone




    Latest News for: chromium

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