A Text book of Experimental Chemistry With Descriptive Notes for Students of G
A Text book of Experimental Chemistry With Descriptive Notes for Students of G
Edwin Lee
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. .. Tip of inner cone 913 . . . . Center of outer cone 1328. . .. Tip of outer cone 728. . .. Side of outer cone, level with tip of in- ner cone 1236. . . . Non-luminous. 54 1090' 1333' SILICON, SI. At. Wt. 28. 4 Mol. Wt. ( ? ). It has been estimated that 27. 3 per cent, of the earth consists of silicon. However, owing to its great affinity for oxygen, it does not occur in nature as an uncombined element. In the combined condition it most frequently occurs as silicon dioxide (silica, SiO 2 ) a...nd in the form of salts of silicic acid silicates. Silicon, like carbon, occurs in several forms, CARBON FAMILY. 241 of which amorphous and crystalline forms are accurately known. Amorphous silicon is a non-lustrous greenish-brown powder which when set on fire in the air undergoes incomplete combustion owing to the formation of an incombustible layer of silicon dioxide. Crystalline silicon (sp. Gr. , 2. 49) is a grayish-black octohedral crystal possessing a metallic luster. It does not change appreciably in the air even at red heat.
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