| Neptunium [Np] (CAS-ID: 7439-99-8) | |
| 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 | |
 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 . |
| Uses |
| Used in neutron detection instruments. |
| Notes |
| It was the first transuranium element produced synthetically and the first actinide series transuranium element discovered. |