Astatine was discovered by Dale Corson, MacKenzie, Segre at 1940 in California, USA.
Origin of name: from the Greek word "astatos" meaning "unstable".
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 vGroup Name: Halogen