This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 Excerpt: ...containing it, by fusing with sodium nitrate and carbonate, extracting the sodium selenate with water, and reducing this with solution of sulphurous acid. 207. Properties.--Selenium like sulphur, is capable of existing in at least two allotropic states: a Selenium, which corresponds to a sulphur, is a dark grayish ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 Excerpt: ...containing it, by fusing with sodium nitrate and carbonate, extracting the sodium selenate with water, and reducing this with solution of sulphurous acid. 207. Properties.--Selenium like sulphur, is capable of existing in at least two allotropic states: a Selenium, which corresponds to a sulphur, is a dark grayish-black solid, of specific gravity 4-8, and is insoluble in carbon di-sulphide. 3 Selenium, is dark reddish-brown in color, has a specific gravity of 4-5, and is soluble in carbon di-sulphide, from which it crystallizes in monoclinic prisms. This is the more stable form of selenium, the form it has when native. A third or amorphous variety with a specific gravity 4-26 is also supposed to exist. On raising the temperature to i00, (l passes into - selenium, with a distinct evolution of heat. - selenium melts a little above i00, and the jS variety at 217. The liquid boils at about 70o. In its chemical properties, selenium very closely resembles sulphur, forming similar compounds with other elements. It burns with a blue flame and gives often an intolerable odor like that of decaying horse-radish. It unites directly with the metals, forming selenides. Tellurium.--Symbol Tc. Atomic weight 128. Equivalence II, IV, and"VI. Density of vapor 128. Molecular volume 2. Specific gravity of solid 6-2. 1 liter of tellurium-vapor at 13900 weighs 11-47 grams 128 criths). 208. History and Preparation.--Tellurium was discovered by Klaproth in 1798, in a Transylvanian gold ore, and named from tcllus, the earth. It occurs even more rarely than selenium, being found native only in Hungary. It exists also in combination with bismuth, lead, gold, and silver. The mode of its preparation is analogous to that of selenium. It is obtained in solution either as po...
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