English Dictionary: astatine | by the DICT Development Group |
2 results for astatine | |
From WordNet (r) 3.0 (2006) [wn]: | |
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From The Elements (22Oct97) [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. |