鉈,化學元素也,符號Tl,原子序八十一,屬主族金屬。色銀灰,遇氧漸啞無光。近乎無味,強酸、水者皆可溶。
鉈劇毒,可致癌,故列國防之甚嚴。昔亦有用以製殺蟲劑,今多禁矣。有鉈中毒者,食普魯士藍可解之,亦有以血液透析、灌流之法解者。
鉈有同位素二十五,原子量介乎百八十四、二百十間。性穩者有二,曰鉈二零三、鉈二零五。
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