85
210 u
At
Astatine
Halogen
Atomic Structure
Physical State
Group
17
Period
6
Block
p
Electron Configuration
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
Physical Properties
Atomic Mass:
210 u
Electronegativity:
2.2
Atomic Radius:
127 pm
Ionization Energy:
9.3 eV
Density:
7 g/cm³
Melting Point:
575 K
Boiling Point:
610 K
Historical Information
Discovered By:
Dale R. Corson
Year Discovered:
1940