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Cadmium: Difference between revisions
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== Properties == | == Properties == | ||
In it's pure form, cadmium is very soft and in solid form has a silvery-white color. It is so incredibly soft that it can easily be cut with a knife, like an alkali metal. It is is very similar to zinc in chemical properties, but it is less reactive with acids than zinc.<ref name=news>[http://www.eoearth.org/article/Cadmium Properties] Unknown author, International Cadmium Association, Accessed December 1st, 2010.</ref> | |||
Cadmium is very resistant to corrosion, particularly in acidic and seawater environments. It has a low melting temperature, good electrical and thermal conductivity. Compounds containing cadmium possess an amazing resistance to high stress and high temperature. They also lower ultraviolet light degradation of certain plastics. Some cadmium electronic compounds exhibit semi-conducting properties, so they are used in solar cells and many electronic appliances. Cadmium pigments produce intense yellow, orange and red colors, and are widely used in plastics, glasses, ceramics, enamels and artists’ colors.<ref name=Cadmium>[http://www.cadmium.org/ Cadmium] Unknown author, International Cadmium Association, Accessed December 1st, 2010.</ref> | Cadmium is very resistant to corrosion, particularly in acidic and seawater environments. It has a low melting temperature, good electrical and thermal conductivity. Compounds containing cadmium possess an amazing resistance to high stress and high temperature. They also lower ultraviolet light degradation of certain plastics. Some cadmium electronic compounds exhibit semi-conducting properties, so they are used in solar cells and many electronic appliances. Cadmium pigments produce intense yellow, orange and red colors, and are widely used in plastics, glasses, ceramics, enamels and artists’ colors.<ref name=Cadmium>[http://www.cadmium.org/ Cadmium] Unknown author, International Cadmium Association, Accessed December 1st, 2010.</ref> | ||
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== Occurrences == | == Occurrences == | ||
[[File: | [[File:Cadmium Smithsonite.jpg|150px|left|Cadmium Smithsonite]] | ||
Cadmium is a fairly rare element. Its abundance in the lithosphere is approximately 0.5 parts per million in the earth's crust. No samples of cadmium have ever been found in large quantities, and there is no ore that is mined solely for recovering cadmium. Greenockite (cadmium sulfide) is the compound with the most significant traces of cadmium, and occurs chiefly as a yellow stain or coating on zinc sulfide. Nearly all major zinc deposits contain cadmium in varying amounts, with the concentrates containing a maximum of about 1%.<ref name=facts>[http://nautilus.fis.uc.pt/st2.5/scenes-e/elem/e04820.html Occurrences] Unknown author, fis.uc.pt, Accessed November 19th, 2010.</ref> | Cadmium is a fairly rare element. Its abundance in the lithosphere is approximately 0.5 parts per million in the earth's crust. No samples of cadmium have ever been found in large quantities, and there is no ore that is mined solely for recovering cadmium. Greenockite (cadmium sulfide) is the compound with the most significant traces of cadmium, and occurs chiefly as a yellow stain or coating on zinc sulfide. Nearly all major zinc deposits contain cadmium in varying amounts, with the concentrates containing a maximum of about 1%.<ref name=facts>[http://nautilus.fis.uc.pt/st2.5/scenes-e/elem/e04820.html Occurrences] Unknown author, fis.uc.pt, Accessed November 19th, 2010.</ref> | ||
