as·ta·tine /ˈæstəˌtin/
石厄
as·ta·tine /ˈæstəˌtɪn/ 名詞
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]
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.