cobalt | Definition & Facts | Britannica.com

With few exceptions, cobalt ore is not usually mined for the cobalt content. Rather, it is often recovered as a by-product from the mining of ores of iron, nickel, copper, silver, manganese, zinc, and arsenic, which contain traces of cobalt.

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Hexavalent chromium - Wikipedia

Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent).Virtually all chromium ore is processed via hexavalent chromium, specifically the salt sodium dichromate.

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Chromium Element Facts - Periodic table

The chemical element chromium is classed as a transition metal. It was discovered in 1780 by Nicolas Louis Vauquelin.

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Platinum | chemical element | Britannica.com

Platinum (Pt), chemical element, the best known and most widely used of the six platinum metals of Groups 8–10 (VIIIb), Periods 5 and 6, of the periodic table.A very heavy, precious, silver-white metal, platinum is soft and ductile and has a high melting point and good resistance to corrosion and chemical attack.

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Chromium - Wikipedia

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 transition metal. ...

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