astatine

n. rare radioactive element (Chemistry)

Astatine (IPA: ) is a chemical element in the periodic table that has the symbol At and atomic number 85. This radioactive element occurs naturally from uranium-235 and uranium-238 decay; it is the heaviest of the halogens.
See more at Wikipedia.org...

Noun
1. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
(synonym) At, atomic number 85
(hypernym) chemical element, element

Atomic Mass : 210
Atomic Number : 85
Name Origins : Greek, astatos = "unstable."
Year Discovered :
1940
Discovery Credits : Produced by D. R. Corson, K. R. Mackenzie, and E. Segre at the University of California, USA.
More Details

    sanitate