Pm
Promethium (Atomic Number 61)
Category: lanthanide | Period 6, Group 3 | Block: f
Radioactive rare earth metal produced artificially in nuclear reactors.
Atomic & Physical Constants
- Standard Atomic Weight:
- 145 u
- Standard State Phase:
- Synthetic
- Electron Configuration:
- 2, 8, 18, 23, 8, 2
- Electronegativity (Pauling):
- 1.13
- Melting Point:
- 1315 K
- Boiling Point:
- 3273 K
Historical Discovery & Real-World Applications
Industrial & Scientific Uses
Atomic miniature nuclear batteries, thickness measuring gauges
Discovery History
Discovered by Chien Shiung Wu (1945).
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