PERIODIC ELEMENT
At (Astatine)

 



Atomic number : 85
Atomic mass : 210 g.mol-1
Electronegativity according to Pauling : 2.2
Density : unknown
Melting point : 302°C
Boiling point : 337 °C (estimation)
Vanderwaals radius : unknown
Ionic radius : unknown
Isotopes : 7
Electronic shell : [Xe] 4f14 5d10 6s2 6p5
Energy of first ionisation : 926 kJ.mol-1
Discovered by : D.R. Corson 1940
 
Atomic Structure Uses (No uses known)