| 单词 | thallium |
| 释义 | Word Frequency thallium(ˈθælɪəm) noun a soft malleable highly toxic white metallic element used as a rodent and insect poison and in low-melting glass. Its compounds are used as infrared detectors and in photoelectric cells. Symbol: Tl; atomic no: 81; atomic wt: 204.3833; valency: 1 or 3; relative density: 11.85; melting pt: 304°C; boiling pt: 1473±10°C Word origin C19: from New Latin, from Greek thallos a green shoot; referring to the green line in its spectrum |
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