Element Copper, Cu, Transition Metal. Between the metals of the new group, which is called after copper. Of the heavy metals already discussed, copper. Besides being used in the pure state, copper. Is also extensively employed for alloys. Brass has already been mentioned; others will be given later. Of the Sinai Peninsula were extensively worked by the Egyptians about the year 3700 b. Must have been known in Cyprus for many centuries previous to their production. Copper daggers found in Northern Italy .

Element Gold, Au, Transition Metal. May have been the first known metal used for ornamentation since Neolithic age, 5000 - 4000 years BC. In Egypt, Mesopotamia, India, China and other ancient countries golden ornamentation. Had been used since 3-2 millennia BC. Alchemists called it the king of metals. Is a trace element; its abundance is 4.

Element Indium, In, Poor Metal. He came to conclusion that his atomic weight should be approximately 114, and its capacity to form alums means that this element belongs to Aluminium subgroup. May embed into their crystal grids.

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.

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.

Element Zinc, Zn, Transition Metal. From the metals of the iron group, to which it is in many respects similar, zinc. Differs in the fact that it cannot form any other stage of combination than that containing divalent ion. In this respect it forms an intermediate member between nickel, which has lost this property for the most part, and magnesium, in the case of which no trace of that property is present. Resist the influence of air and water fairly well.