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Discovered by Dale R. Carson, K.R. Mackenzie, and Emilio Serge in 1940. They bombarded an isotope of bismuth with alpha particles accelerating a device called cyclotron. Conducted at the University of California.



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Element Info

Symbol: At

Atomic Number: 85

Atomic Weight: 210

Melting Point: 575 K (302°C or 576°F)

Boiling Point: Unknown

Density: about 7 grams per cubic centimeter

Phase at Room Temperature: Solid

Element Classification: Semi-metal

Period Number: 6

Group Number: 17

Name Origin: From the Greek word for unstable, astatos.