The periodic table/Astatine

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Astatine was discovered in University of California, Berkeley, USA by Dale R. Corson, K. R. MacKenzie, and Emilio Segre in 1940.

Quick Facts[edit]

Name: astatine atom

Symbol: At

Atomic Mass: 210 amu

Classification: group 7 (halogens)

Protons: 85

Electrons: 85

Neutrons: 125

Colour: unknown, predicted to be black

Discovery in: 1940

Density: unknown

Crystal Structure: unknown

Melting Point: 302 °C (575 K)

Boiling Point: 337 °C (610 K)

Common Uses: radiation therapy, medical uses