atomic number 85

Noun

atomic number 85 - a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

astatine, At

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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