Look up: Astatine

1. 
   Astatine
   Astatine is a radioactive halogen element which was discovered by bombarding bismuth with alpha particles and is also released by radioactive decay. It has the symbol At.
   Found on http://www.encyclo.co.uk/nol.php
   
   
2. 
   astatine
   [n] - a highly unstable radioactive element (the heaviest of the halogen series)
   Found on http://www.webdictionary.co.uk/definitio
   
   
3. 
   Astatine
   The heaviest halogen and radioactive. Symbol At Also known as Alabamine
   Found on http://www.diracdelta.co.uk/science/sour
   
   
4. 
   astatine
   a radioactive element belonging to the halogens,discovered by bombarding bismuth with helium nuclei and also formed by radioactive decay Category: Chemistry • chemical element:atomic number 85 Category: Chemistry
   Found on http://www.mijnwoordenboek.nl/definition
   
   
5. 
   astatine
   <chemical> Astatine. A radioactive halogen with the atomic symbol at, atomic number 85, and atomic weight 210. Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life. Astatine may be of use in the treatment of hyperthyroidism. ... Chemical name: Astatine ... (12 Dec 1998) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
6. 
   astatine
   At noun a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
7. 
   Astatine
   `Astatine` is a chemical element with the symbol `At` and atomic number 85. This radioactive element occurs naturally from uranium-235 and uranium-238 decay. It is the heaviest of the halogens.
   Found on http://en.wikipedia.org/wiki/Astatine
   
   
8. 
   astatine
   (At) (as´tә-tēn) a chemical element, atomic number 85, atomic weight 210.
   Found on http://www.mercksource.com/pp/us/cns/cns
   
   
9. 
   astatine
   radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (Group VIIa) of the periodic table. Astatine, which has no ... [2 related articles]
   Found on http://www.britannica.com/eb/a-z/a/115
   
   
10. 
    astatine
    An artificial radioactive element of the halogen series; atomic no. 85, atomic wt. 211. [G. astatos, unstable]
    Found on http://www.stedmans.com/section.cfm/45
    
    
11. 
    astatine
    (At) A semimetallic, highly unstable radioactive element (atomic numer 85) that resembles iodine in solution and accumulates in the thyroid gland. Astatine is a member of the halogen family of elements. It occurs naturally in minute quantities, and can be prepared by bombarding ...
    Found on http://www.daviddarling.info/encyclopedi
    
    
12. 
    astatine
    astatine (ăs'tutēn,–tin) [Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302°C (estimated); b.p. 337°C (estimated); density unknown; valence believed to be +1, +3, +5, or +7. Astatine is the hea...
    Found on http://www.infoplease.com/ce6/sci/A08051