atomic number 85 - Hutchinson encyclopedia article about atomic number 85 Printer Friendly
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astatine
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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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