Cadmium

Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Like zinc, it prefers oxidation state +2 in most of its compounds and like mercury it shows a low melting point compared to transition metals. Cadmium and its congeners are not always considered transition metals, in that they do not have partly filled d or f electron shells in the elemental or common oxidation states. The average concentration of cadmium in the Earth's crust is between 0.1 and 0.5 parts per million (ppm). It was discovered in 1817 simultaneously by Stromeyer and Hermann, both in Germany, as an impurity in zinc carbonate.

Cadmium occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production. It was used for a long time as a pigment and for corrosion resistant plating on steel while cadmium compounds were used to stabilize plastic. With the exception of its use in nickel–cadmium batteries and cadmium telluride solar panels, the use of cadmium is generally decreasing. These declines have been due to competing technologies, cadmium’s toxicity in certain forms and concentration and resulting regulations. Although cadmium has no known biological function in higher organisms, a cadmium-dependent carbonic anhydrase has been found in marine diatoms.

Read more about Cadmium:  History, Occurrence, Production, Applications, Biological Role, Safety

Other articles related to "cadmium":

Cadmium Telluride Photovoltaics - Issues - Other Issues - Cadmium
... and recycling of the extremely toxic metal cadmium, one of the six most toxic materials banned by European Union's RoHS regulation ...
List Of Inorganic Pigments - Orange Pigments
... Cadmium pigments Cadmium Orange (PO20) an intermediate between cadmium red and cadmium yellow cadmium sulfoselenide ...
Cadmium Acetate
... Cadmium acetate is the chemical compound with the formula Cd(CH3CO2)2 ... classified coordination polymer, featuring acetate ligands interconnecting cadmium centers ... It forms by treating cadmium oxide with acetic acid CdO + 2 CH3COOH → Cd(CH3COO)2 + H2O ...
Semicarbazide-cadmium Therapy
... Semicarbazide-cadmium therapy was an experimental cancer therapy that was tested in several clinical trials in the Soviet Union during the 1960s ... Cadmium is a heavy metal and can also induce apoptosis ...
Cadmium - Safety - Product Recalls
... was cancelled after the seats were discovered to contain trace amounts of cadmium ... Reports of high levels of cadmium use in children's jewelry in 2010 led to a US Consumer Product Safety Commission investigation ... CPSC issued specific recall notices for cadmium content applying to jewelry sold by Claire's and Wal-Mart stores ...