astatine

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

Elements of periodic system. 2013.

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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 — 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

  • astatinė sistema — statusas T sritis automatika atitikmenys: angl. astatic system vok. astatisches System, n rus. астатическая система, f pranc. système astatique, m …   Automatikos terminų žodynas

  • astatinė sistema — statusas T sritis fizika atitikmenys: angl. astatic system vok. astatisches System, n; System ohne P Abweichung, n rus. астазированная система, f; астатическая система, f pranc. système astatique, m …   Fizikos terminų žodynas

  • astatinė rodyklė — statusas T sritis fizika atitikmenys: angl. astatic needle vok. astatische Nadel, f rus. астатическая стрелка, f pranc. aiguille astatique, f …   Fizikos terminų žodynas

  • astatinė švytuoklė — statusas T sritis fizika atitikmenys: angl. astatic pendulum vok. astatisches Pendel, n rus. астатический маятник, m pranc. pendule astatique, m …   Fizikos terminų žodynas

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