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Cr
Chromium
Atomic no.:
24
Atom. weight: 51.996
Density: 7.1
Class:
Heavy metal
Melting point: 1857°C
Boiling point: 2672°C
Colour: silvery shiny
   
Discoverer: N.L. Vanquelin
Place: Paris, France
Year: 1780

Discovered in 1780 by N.L. Vanquelin in Paris, France. Chromium is a bright, blue/white metal with excellent corrosion resistance. It is obtained by the aluminum reduction of Cr2O3, the source of which is chromite, a double oxide of chromium and iron which generally also contains magnesium. It has an abundance within the earth's crust of approximately 100 ppm. Chromium is soluble in HCl and H2SO4, but not in H3PO4, HNO3 or HClO4 due to the formation of a stable and insoluble oxide layer on its surface; this, along with its hardness, has been used to advantage in the chromium plating of steel which has good corrosion resistance. Chromium is alloyed with nickel in the manufacture of heat resisting alloys, and with iron, or nickel and iron, to produce stainless and heat resistant steels. Chromium is an important trace element for humans as it assists in the manufacture of glucose.

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 Chromium 3+ doped glass bead NEW!  Art. Nr. 004865  
Chromium 3+ doped glass bead NEW!
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Glass bead doped with 1% Chromium(III) oxide - NEW!

Size about 10mm . Material: Ba-P:Cr

Nice glass bead. Each one handmade of phosphate glass in our lab.

  • This time we used a bit less Chromium(III)-Oxide which results in this shiny green color.

Amount: 1 St. / 1 pc.
Purity : --
Packing: ampoule
20.00
- tax free

Availability: 3 in stock

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 Pure chromium fragments in ampoule 99.95% purity 5g  Art. Nr. 004060  
Pure chromium fragments in ampoule 99.95% purity 5g
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Pure chromium fragments in ampoule 99.95% purity 5g

These nice Chromium fractures are ideal for your element collection or for lab use.

Amount: 1 piece/Stk.
Purity : 99.95%
Packing: Ampoule
20.00
- tax free
5-9 pcs.: 19.00 Euro
>9 pcs.: 18.00 Euro
Availability: 70 in stock

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