Silicone oxygen and

Silicates (compounds made up of silicon, oxygen and one or more metals with or without hydrogen. Asbestos dust is the most hazardous (page 55). Others, e.g. talc, mica, vermiculite, have caused a silicatosis on prolonged exposure.)... 

Silicates (compounds made up of silicon, oxygen and one or more metals with or without hydrogen. Asbestos dust is the most... 

Iron is one of the most abundant metals in the upper crust of the earth. It is the fourth mineral-forming element (after silicon, oxygen, and aluminum), constituting about 5% of the earth s crust (see Table 1). Large deposits of its ores are numerous, widely distributed, and easily accessible. 

Remaining for a moment with the massive stars, a distinction must be made between slow, secular, quasi-static and explosive nucleosynthesis. The time-scale in the latter case is of the order of 1 second and it only affects the innermost layers of stars, rich in silicon, oxygen and carbon. 

TABLE 19. Derived silicon-oxygen and silicon-nitrogen bond dissociation energies (kJmol-1)a... 

Silicon (Si) Silicon is a lustrous silvery gray material. Because silicon conducts electricity, but not as well as a metal, silicon is classified as a semimetal. Crystals of pure silicon that have been doped with arsenic or gallium are known as semiconductors and are used to fabricate computer chips. Silicone rubbers are polymers containing silicon, oxygen, and various hydrocarbon groups, and are used in applications ranging from sealants to breast implants. 

SILICON-OXYGEN AND ALUMINIUM-OXYGEN BOND LENGTHS ( ) IN ZEOLITE-A, SPACE GROUP Fm3c ... 

A group of compounds known as the siloxanes were produced at about the same time. The siloxanes are made up of silicon, oxygen, and an organic group. Organic compounds contain carbon. 

Magnesium aluminum silicate is a polymeric complex of magnesium, aluminum, silicon, oxygen, and water. The average chemical analysis is conventionally expressed as oxides ... 

Fig. 5.14 Side view of a slab model of the surface of amorphous silica [55]. The top surface consists only of Si and O atoms the bottom one is fully hydroxylated. Black, light grey and white spheres are silicon, oxygen and hydrogen atoms, respectively. The large spherical oxygen and all the silicon atoms are to scale with the interatomic distances.

The silicon-halogen, silicon-oxygen, and silicon-sulfur bonds of the haiogenosil-anes, siiyl ethers, and siiyi thioethers are cleaved by reaction with LAH, AIH3, or DIBAH, and the corresponding siiyl hydrides are obtained [CGI, CG2]. Ultrasound activation can be applied [LG2] (Figure 5.9), Anionic pentacoordinated silicon compounds are reduced to hydrogenosilanes by LAH or DIBAH [BC6]. 

Occurrence.—In nature as carbonate in the numerous ante pan, ehalk, marble, Ae. as tetnhydrie caMc Bulpbato (8Ho,Cao") in ggpeum, alabaster, selenite, c. as phosphate In apatite and phosphorite (see p. 116) m fluoride in tba finer spars (see p. 66), and in combination with silicon, oxygen, and other metals in numerous minerals. 

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