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more about astatine
astatine |
2 definitions found From WordNet r 1.6 [wn]: astatine n : a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium [syn: {At}, {atomic number 85}] From Elements database 20001107 [elements]: astatine Symbol: At Atomic number: 85 Atomic weight: (210) Radioactive halogen element. Occurs naturally from uranium and thorium decay. At least 20 known isotopes. At-210, the most stable, has a half-life of 8.3 hours. Synthesized by nuclear bombardment in 1940 by D.R. Corson, K.R. MacKenzie and E. Segre at the University of California.
more about astatine
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