astatine

[n] - a highly unstable radioactive element (the heaviest of the halogen series)
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Astatine

The heaviest halogen and radioactive. Symbol At Also known as Alabamine
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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) ...
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astatine

At noun a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
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astatine

(At) (as´tә-tēn) a chemical element, atomic number 85, atomic weight 210.
Found on http://www.encyclo.co.uk/local/21001

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

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 ...
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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...
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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.
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astatine

(At) Type: Term Pronunciation: as′tă-tēn Definitions: 1. An artificial radioactive element of the halogen series; atomic no. 85, atomic wt. 211.
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astatine

Non-metallic, radioactive element, atomic number 85, relative atomic mass 210. It is a member of the halogen group, and is found at the bottom of Group 7 of the periodic table of the elements. It is very rare in nature. Astatine is highly unstable, with at least 19 isotopes; the longest lived has a half-life of about eight hours
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Astatine

Astatine is a radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth only as the result of the radioactive decay of certain heavier elements. All of its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. Accordingly, much less is known about astatine than most other ...
Found on http://en.wikipedia.org/wiki/Astatine
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