| 单词 | silicon |
| 释义 | Word Frequency silicon(ˈsɪlɪkən) noun a. a brittle metalloid element that exists in two allotropic forms; occurs principally in sand, quartz, granite, feldspar, and clay. It is usually a grey crystalline solid but is also found as a brown amorphous powder. It is used in transistors, rectifiers, solar cells, and alloys. Its compounds are widely used in glass manufacture, the building industry, and in the form of silicones. Symbol: Si; atomic no: 14; atomic wt: 28.0855; valency: 4; relative density: 2.33; melting pt: 1414°C; boiling pt: 3267°C b. (modifier; sometimes capital) denoting an area of a country that contains a density of high-technology industry Word origin C19: from silica, on the model of boron, carbon |
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