Periodic Table of the Elements Astatine

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astatine

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

astatine (symbol At) Semimetallic radioactive element that is one of the halogens (group VII of the periodic table). It is rare in nature, and is found in radioactive decay. At211 will collect in the thyroid gland and is used in medicine as a radioactive tracer. Properties: at.no. 85; r.a.m. 211; m.p. 302°C (575.6°F); b.p. 377°C (710.6°F); most stable isotope At210 (half-life 8.3hr).
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Periodic Table of the Elements: Astatine

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

Periodic Table of the Elements: Astatine

Periodic Table of the Elements: Astatine
Atomic Number: 85
Atomic Symbol: At
  Astatine
Atomic Weight: (210)
Electron Configuration: 2 · 8 · 18 32 · 18 · 7

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