Np
Neptunium (Atomic Number 93)
Category: actinide | Period 7, Group 3 | Block: f
First synthetic transuranic actinide element discovered.
Atomic & Physical Constants
- Standard Atomic Weight:
- 237 u
- Standard State Phase:
- Synthetic
- Electron Configuration:
- 2, 8, 18, 32, 22, 9, 2
- Electronegativity (Pauling):
- 1.36
- Melting Point:
- 912 K
- Boiling Point:
- 4447 K
Historical Discovery & Real-World Applications
Industrial & Scientific Uses
High-sensitivity neutron detection devices, plutonium precursor
Discovery History
Discovered by Edwin McMillan (1940).
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