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Astatine (Atomic Number 85)
Category: halogen | Period 6, Group 17 | Block: p
Rarest naturally occurring element in Earth crust; radioactive halogen.
Atomic & Physical Constants
- Standard Atomic Weight:
- 210 u
- Standard State Phase:
- Solid
- Electron Configuration:
- 2, 8, 18, 32, 18, 7
- Electronegativity (Pauling):
- 2.2
- Melting Point:
- 575 K
- Boiling Point:
- 610 K
Historical Discovery & Real-World Applications
Industrial & Scientific Uses
Targeted alpha-particle radionuclide cancer therapy
Discovery History
Discovered by Dale R. Corson (1940).
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