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]
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