Neptunium [Np] (CAS-ID: 7439-99-8) locate me
An: 93 N: 144 Am: [237]
Group Name: Actinoid
Block: f-block  Period: 7 (actinoid)
State: solid at 298 K
Colour: silvery metallic Classification: Metallic
Boiling Point: 4273K (4000'C)
Melting Point: 910K (637'C)
Density: 20.2g/cm3
Shell Structure diagram | Atomic Radius diagram
Isotopes | More Info
Discovery Information
Who: E.M. McMillan, P.H. Abelson
When: 1940
Where: United States
Name Origin
From planet Neptune.
Sources
Produced by bombarding uranium with slow neutrons. Neptunium is also found in trace amounts in uranium ores.
Uses
Used in neutron detection instruments.
Notes
It was the first transuranium element produced synthetically and the first actinide series transuranium element discovered.