A portrait of neptunium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements.
| Np | Neptunium |
Atomic number : 93
Relative atomic mass (12C = 12.0000) : 237.0482 |
|||||||
| P H Y S I C A L D A T A | |
|
Group 3 actinide Density / kg m-3 : 20 250 [293 K] |
Melting point / K : 913 Boiling point / K : 4175 |
| D I S C O V E R Y | |
|
Neptunium was prepared in 1940 by Edwin M. McMillan and Philip H. Abelson at Berkeley, California, USA. |
|
| G E O L O G I C A L D A T A | |
|
Abundances Sun (relative to H = 1 × 1012) : n.a. Earth's crust / p.p.m. : Neptunium is present in minute quantities in uranium ores, and is formed when one of the emitted neutrons, from a uranium atom undergoing fission, is captured by another uranium nucleus. |
Seawater / p.p.m. : nil |
| B I O L O G I C A L D A T A | |
|
Level in humans nil |
Daily dietary intake : nil Total mass of element in average (70 kg) person : nil |
|
|
A portrait of neptunium is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |