Astatine (At)

Astatine (At)

Atomic Number: 85
Atomic Weight: (210)
Melting Point: 302
Boiling Point: 337
Specific Gravity: not known
Valence(s): -1, 3, 5 or 7

Astatine was first synthesised by Corson, MacKenzie, and Serge in 1940 by bombarding Bismuth with alpha particles. Astatine is a rare, radioactive Halogen that exists in minute quantities with Uranium and Thorium. There is less than one ounce of astatine in the earth's crust. [LM] {RW}