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 in 1940 by D.R. Corson, K.R. MacKenzie and E. Segre at the University of California.

Elements of periodic system. 2013.

  • 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 — 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

  • astatine — An artificial radioactive element of the halogen series; atomic no. 85, atomic wt. 211. [G. astatos, unstable] * * * as·ta·tine as tə .tēn n a radioactive halogen element discovered by bombarding bismuth with helium nuclei and also formed by… …   Medical dictionary

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