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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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.