单词 | beryllium |
释义 | Word Frequency beryllium(bɛˈrɪlɪəm) noun a corrosion-resistant toxic silvery-white metallic element that occurs chiefly in beryl and is used mainly in X-ray windows and in the manufacture of alloys. Symbol: Be; atomic no: 4; atomic wt: 9.012; valency: 2; relative density: 1.848; melting pt: 1289°C; boiling pt: 2472°C Former names: glucinum, gluciniumWord origin C19: from Latin bēryllus, from Greek bērullos, beryl |
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