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
How would you define astatine?