'astatine' definitions:
Definition of 'astatine'
(from WordNet)
noun
A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium [syn: astatine, At, atomic number 85]
Definition of 'astatine'
From: Elements
- 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.