Neptunium

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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
NdPmSm
U ← Np → Pu
N/AN/AN/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

  1. CRC HANDBOOK of CHEMISTRY and PHYSICS 64TH EDITION (C)1983, page B-307



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