astatine definition

  • noun:
    • A highly unstable radioactive element, the heaviest associated with the halogen show, that resembles iodine in option. Its longest resided isotope features a mass range 210 and has a half-life of 8.3 hours. Atomic quantity 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7. See Table at element.
    • an extremely radioactive chemical factor (icon At), among halogens, with atomic number 85.
    • an extremely unstable radioactive factor (the heaviest associated with the halogen series); a decay item of uranium and thorium
    • an extremely volatile radioactive factor, the heaviest of the halogen series, that resembles iodine in option. Its longest lived isotope has actually a mass wide range of 210 and contains a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling-point 337°C; valence most likely 1, 3, 5, 7. See dining table at element.
    • an extremely radioactive substance element (symbolization At), among the halogens, with atomic number 85.
    • a very volatile radioactive factor (the heaviest for the halogen series); a decay item of uranium and thorium

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