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Astatine

//ˈæstəˌtin// noun

Definitions

Noun
  1. 1
    A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85. countable, uncountable

    "Astatine, for instance, is practically unstudied. It has a name and a place on the periodic table (next to Marie Curie's polonium), but almost nothing else."

  2. 2
    a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium wordnet

Etymology

From Ancient Greek ἄστατος (ástatos, “unstable”) + -ine.

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