Element Antimony, Sb, Metalloid. Is allied on the one hand to bismuth, and on the other, to arsenic and phosphorus. It therefore forms a transition element between the metals and the non-metals, but is still essentially on the side of the metals. Its combining weight is Sb. Probably, therefore, we are dealing with a mixture of different kinds of vapour, perhaps Sb. Is known from high antiquity. Oriental countries were familiar with Antimony.

Element Germanium, Ge, Metalloid. Matched those of the eka-silicon whose existence had been predicted in 1871 by Dmitri Mendeleev. By mass, more than that of Antimony, Silver and Bismuth.

Element Phosphorus, P, Non Metal. The name phosphorescence, used in physics for the after luminescence shown by certain substances after a previous exposure to light, is a relic of that usage. At the present day, the name phosphorus. The nerve and brain substances, more especially, are comparatively rich in phosphorus, which is there .

Element Selenium, Se, Non Metal. Whereas the amorphous selenium does not conduct the electric current to a measurable extent, the property of conductivity is possessed by the crystalline form. Hydrogen selenide is the hydrogen acid of selenium in the same sense as hydrogen sulphide is the hydrogen acid of sulphur; its aqueous solution contains the ions Se. By heating selenium with iron filings, and to treat this with hydrochloric acid. In a manner perfectly analogous to the prep.

Element Silicon, Si, Metalloid. Silicon stands to carbon in the same relation as sulphur to oxygen. The two elements are similar in many respects, but differ more from one another than, for example, chlorine, bromine, and iodine do. Like carbon, occurs in several forms, of which an amorphous and a crystalline form are accurately known. Amorphous silicon is obtained by conducting its chlorine or fluorine compound over heated potassium; the metal unites with the halogen, and the silicon.

Element Tellurium, Te, Metalloid. While iodine is very similar to bromine, if not in external appearance, at least in the nature of the corresponding compounds, the differences between selenium and tellurium are more pronounced, so that it has repeatedly been regarded as doubtful whether these two elements ought to be regarded as members of the same family. The combining weight of tellurium, Te. Combines with the metals to form tellurides; these correspond to the sulphides.

Element Tin, Sn Stannum, Poor Metal. Has been used, since epochs of Homer and Moses. Alluvial aggradations are found much more often and may be processed much easier than other ores. Brythons were closely familiar with tin. As Cornwall slag hills testify.