Element Chlorine, Cl, Hallogen.

Element Fluorine, F, Halogene. To the group of halogen elements there must also be added the element fluorine, which differs in its properties more widely from the other three than these from one another. It exhibits, however, still fewer relationships with the rest of the elements, and is, therefore, most suitably classed along with the halogens. Compounds of fluorine are fairly widely distributed in nature. It occurs in small quantity in many rocks, and its calcium compound, fluorspar, is a very ab.

Element Nitrogen, N, Non Metal. There is present in the air, besides oxygen, another substance which constitutes the greater part both by weight and by volume. From the fact that the residue of the air after removal of the oxygen can support neither combustion nor life, it was called azote, but it is now called nitrogen. Its chemical symbol is N. Its combining weight is N. Is in so far of especia.

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 Strontium, Sr, Alkaline Earth Metal. Strontium forms only the divalent ion Sr. Whose solutions are colourless, and whose heat of formation is 501 kj. A very rare mineral, which before that could be found only in a couple of collections, named after the village of Strontian, Lochaber, Scotland. A mineral consisting of barium sulphate. He called the mineral strontianite.

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