Answer: astatine

AnswerCrossword Clue
ASTATINEHalogen family element
ASTATINERadioactive element
ASTATINEElement No. 85.
ASTATINEElement between polonium and radon on the periodic table
ASTATINERarest naturally occurring element in the earth's crust
astatinerare element of the halogen family. Symbol: At; at. no.: 85