in the 12. The elements zinc , cadmium and mercury and that are for the first time 1996 manufactured element 112 Ununbium contained of group of the periodic system. Zinc seems to -3 % in the earth's crust with a relative frequency of 7*10. Cadmium with 2*10 -5 % the groupoften also group of zinc one calls. Frequently the elements seem to the group of zinc as sulfides. One speaks then also of screens. In order to win the elements, the sulfides are first roasted, reduced afterwards with carbon and finally distilled.


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