Element Cadmium, Cd, Transition Metal. 1124; the formula of the element in the vaporous state is therefore Cd. Forms only one elementary ion, divalent cadmion, Cd. The metal dissolves, although very slowly, in aqueous acids with formation of this ion. Cadmion is colourless, and acts as a rather virulent poison on the lower and higher organisms. Its heat of formation from the metal is 77 kj. Is soluble in excess of ammonia. The solution contains complex cadmium-ammonia ions, Cd. Of the salts the sulphate .

The date and time of element 110, Darmstadtium. The only one atom was produced at the beginning. It was produced by fusion of nickel and lead atoms accelerated in UNILAC accelerator of GSI. Only one atom of Darmstadtium.

In its chemical relations mercury, or Hydrargyrum, is most nearly allied to copper, since it forms, like it, two elementary ions, a monovalent and a divalent, which in many respects also are similar to those of copper. With cadmium it shares the tendency to form slightly dissociated halogen compounds of the divalent series. Pneumatic trough for the investigation of gases at once led to the discovery of a series of hitherto unknown substances.

Element Palladium, Pd, Transition Metal. Was discovered by William Hyde Wollaston in 1803, also in raw platinum, in the part soluble in aqua regia. When Wollaston separated some quantity of the metal, he, without reporting about the discovery, distributed anonymous advertising about new metal named palladium. This element was named by Wollaston in 1804 after the asteroid Pallas, which was discovered by named by astronomer Heinrich Wilhelm Matthäus Olbers two years earlier.

On account of its remarkable properties and of its occurrence in the metallic state, silver. In the pure state silver is a white tenacious metal, which can be readily drawn into wire, and made into very thin sheets by rolling or hammering. For use it is alloyed with 10 per cent of copper in order to make it harder. It conducts heat and electricity very well, and occupies, in this respect, the first place among the metals. Is also found in native form.