astatine
An artificial radioactive element of the halogen series; atomic no. 85, atomic wt. 211. [G. astatos, unstable]

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as·ta·tine 'as-tə-.tēn n a radioactive halogen element discovered by bombarding bismuth with helium nuclei and also formed by radioactive decay symbol At called also ekaiodine see ELEMENT (table)

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as·ta·tine (At) (asґtə-tēn) [Gr. astatos unstable] the radioactive element of atomic number 85, atomic weight 210. It is prepared by alpha particle bombardment of bismuth on the cyclotron. It has a half-life of 75 hours and may be of use in the treatment of hyperthyroidism.

Medical dictionary. 2011.

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  • Astatine — (pronEng|ˈæstətiːn) is a radioactive chemical element with the symbol At and atomic number 85. It is the heaviest of the discovered halogens. Characteristics This highly radioactive element has been confirmed by mass spectrometers to behave… …   Wikipedia

  • astatine — Symbol: At Atomic number: 85 Atomic weight: (210) Radioactive halogen element. Occurs naturally from uranium and thorium decay. At least 20 known isotopes. At 210, the most stable, has a half life of 8.3 hours. Synthesized by nuclear bombardment… …   Elements of periodic system

  • astatine — radioactive element, named 1947, from Gk. astatos unstable (see ASTATIC (Cf. astatic)) + chemical suffix INE (Cf. ine) (2). So called for its short half life and lack of stable isotopes. The element appears not to have a stable form and probably… …   Etymology dictionary

  • astatine — ☆ astatine [as′tə tēn΄, as′tətin΄ ] n. [< Gr astatos, unstable + INE3] a radioactive chemical element, one of the halogens, formed from bismuth when it is bombarded by alpha particles: it resembles iodine in its chemical properties: symbol,… …   English World dictionary

  • astatine — /as teuh teen tin/, n. Chem. a rare element of the halogen family. Symbol: At; at. no.: 85. [1945 50; < Gk ástat(os) not steadfast, unstable (see ASTATIC) + INE2] * * * ▪ chemical element Introduction  radioactive chemical element and the… …   Universalium

  • astatine — astatas statusas T sritis chemija apibrėžtis Cheminis elementas. simbolis( iai) At atitikmenys: lot. astatinum angl. astatine rus. астат; астатин ryšiai: sinonimas – astatinas …   Chemijos terminų aiškinamasis žodynas

  • astatine — astatinas statusas T sritis fizika atitikmenys: angl. astatine vok. Astat, n; Astatin, n rus. астат, m pranc. astate, m …   Fizikos terminų žodynas

  • astatine — noun Etymology: Greek astatos unsteady, from a + statos standing, from histanai to cause to stand more at stand Date: 1947 a radioactive halogen element discovered by bombarding bismuth with alpha particles and also formed by radioactive decay… …   New Collegiate Dictionary

  • Astatine — Astate Astate …   Wikipédia en Français

  • astatine — noun /ˈæstətiːn,ˈæstətɪn/ A highly radioactive chemical element (symbol At) with atomic number 85 and one of the halogens.<!encyclopedic info It occurs in only one isotope with an atomic mass of 210. It is intensely radioactive with a half… …   Wiktionary

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