atomic number 85

Thesaurus

Noun

1.atomic number 85 - a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thoriumastatine, Atchemical 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 matterhalogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions