Astatine

85
At
210

Properties

Symbol Name Atomic Number Atomic Weight Group Number
At Astatine 85 210 17

Description

Standard State: solid at 298 K
Color: metallic

Astatine was synthesized in 1940 by D.R. Corson, K.R. MacKenzie, and E. Serge at the University of California by bombarding bismuth with alpha particles. It has rarely been produced to date.  Workers at Brookhaven National Laboratory have recently used reactive scattering in crossed molecular beams to identify and measure elementary reactions involving astatine.