Ra
Radium (Atomic Number 88)
Category: alkaline | Period 7, Group 2 | Block: s
Intensely radioactive alkaline earth metal discovered by the Curies.
Atomic & Physical Constants
- Standard Atomic Weight:
- 226 u
- Standard State Phase:
- Solid
- Electron Configuration:
- 2, 8, 18, 32, 18, 8, 2
- Electronegativity (Pauling):
- 0.9
- Melting Point:
- 1233 K
- Boiling Point:
- 2010 K
Historical Discovery & Real-World Applications
Industrial & Scientific Uses
Historical self-luminous dials, targeted cancer therapy sources
Discovery History
Discovered by Pierre Curie (1898).
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