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.
How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
| ?Page tools | ||
|---|---|---|
|
?Sign in  |
|---|