85

Radioactive

At

Astatine

(210)

Halogen
Solid

Discovery

Corson, Dale R. & Mackenzie, K. R. (1940)

Etymology

Greek

Meaning

Unstable

Electron configuration

Electron configuration

Crystal structure

Crystal structure

Face-centered cubic

Physical Properties

Phase

  (at 21 °C and 101.325 kPa)

Solid

Melting point

  (at 101.325 kPa)

302.0 °C

575.15 K

Boiling point

  (at 101.325 kPa)

962.0 °C

1235.15 K

Electronegativity

2.20