单词 | thallium |
释义 | thallium /thal"ee euhm/, n. Chem. a soft, malleable, rare, bluish-white metallic element: used in the manufacture of alloys and, in the form of its salts, in rodenticides. Symbol: Tl; at. wt.: 204.37; at. no.: 81; sp. gr.: 11.85 at 20°C. [1860-65; < NL, equiv. to thall- ( < Gk thallós green stalk) + -ium -IUM; named after green line in its spectrum] |
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