Neptunium
(Redirected from Np)
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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