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/ English Dictionary

ATOMIC NUMBER 85

 I. (noun) 

Sense 1

Meaning:

A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thoriumplay

Synonyms:

astatine; At; atomic number 85

Classified under:

Nouns denoting substances

Hypernyms ("atomic number 85" is a kind of...):

chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)

halogen (any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions)

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