›› Physical and chemical properties of Astatine

Atomic Number:85
Element Symbol:At
Element Name:Astatine
Atomic Weight:210
Group Number:17
Group Name:Halogen
Period Number:6
Ground State Configuration:[Xe] 4f14 5d10 6s2 6p5
Ground State Level:2Po3/2
Standard State:Solid
Common Valences:1,3,5,7
Atomic Radius Calculated:127
Electron Affinity:270.1
First Ionization Energy:920
Pauling Electronegativity:2.2
Allred Rochow Electronegativity:1.90
Mulliken Jaffe Electronegativity:2.85
Melting Point:302
Thermal Conductivity:2
Enthalpy Of Fusion:about 6 (per mol At atoms)
Enthalpy Of Vaporization:about 40
Most Common Oxidation Numbers:1,-1
Discovered By:Dale Corson, MacKenzie, Segre
Discovered At:California, USA
Discovered When:1940
Origin Of Name:From the Greek word astatos meaning unstable

Calculate the molecular weight of Astatine or molecular weight At.

Also see the full list of chemical elements and atomic weights.