Write about Cadmium atom?

     

Cadmium is a chemical element with the symbol Cd and atomic number 48.  This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, Zinc and mercury.  Like Zinc it demonstrates oxidation state +2 in most of its compounds and like mercury, it has a lower melting point than the transition metals in groups 3 through 11.  Cadmium and its congeners in group 12 are often not 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 Earth's crust is between 0.1 and o.5 parts per million.  It was discovered in 1817 simultaneously  by Stromeyer and Hermann, both in Germany as an impurity in Zinc carbonte.

     Cadmium occurs as a minor component in most zinc ores and is a byproduct of zinc production.  Cadmium was used for a long time as a corrosion-resistant plating on steel, and cadmium compounds are used as red, orange and yellow pigments, to color glass, and to stabilize plastic.

     Although cadmium has no known biological function in higher organisms, a cadmium-dependent carbonic anhydrase has been found in marine diatoms.