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astatine

noun
/ˈæstətiːn/
/ˈæstətiːn/
[uncountable]
(symbol At)
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  1. a chemical element. Astatine is a radioactive element that is found in small amounts in nature, and is produced artificially for use in medicine.砹(放射性化学元素)
    Word Origin1940s: from Greek astatos ‘unstable’ + -ine.
astatine
Chemical elements:actinium, alkali metal, americium...

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