Neptunium
Revision as of 07:40, 30 May 2011 by 207.224.85.91 (adding half-life and reference)
| Neptunium | |
|---|---|
| Np | |
| In situ availability: | |
| Necessity: | |
| Atomic number: | 93 |
| Atomic mass: | [237] |
| group: | 19 |
| period: | N/A |
| normal phase: | Solid |
| series: | Actinide |
| density: | 20.2 g/cm3 |
| melting point: | 910K, 637°C, 1179°F |
| boiling point: | 4273K, 4000°C, 7232°F |
| Nd ← Pm → Sm | |
| U ← Np → Pu | |
| N/A ← N/A → N/A | |
| Atomic radius (pm): | 175 |
| Bohr radius (pm): | |
| Covalent radius (pm): | |
| Van der Waals radius (pm): | |
| ionic radius (pm): | (+5) 75 |
| 1st ion potential (eV): | 6.27 |
| Electron Configuration | |
| 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f4 6s2 6p6 6d1 7s2 | |
| Electrons Per Shell | |
| 2, 8, 18, 32, 22, 9, 2 | |
| Electronegativity: | 1.3 |
| Electron Affinity: | - |
| Oxidation states: | 6, 5, 4, 3 |
| Magnetism: | ? |
| Crystal structure: | Orthohombic |
Neptunium is a Actinide metal.
It has a Orthohombic crystalline structure.
It does not have any isotopes considered to be natural. Its longest-lived known isotope has an atomic number of 237 and a half-life of 2.1 million years.[1] This element has no stable isotopes.
Reference
- ↑ CRC HANDBOOK of CHEMISTRY and PHYSICS 64TH EDITION (C)1983, page B-307
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