Neptunium
Neptunium General
Name:Neptunium | Symbol:Np |
Type:Rare Earth, Actinides | Atomic weight:237.0482 |
Density @ 293 K:20.45 g/cm3 | Atomic volume:11.62 cm3/mol |
Discovered:
1940 |
Neptunium States
State (s, l, g):solid | |
Melting point:913.2 K | Boiling point: 4175 K |
Neptunium Energies
Specific heat capacity:0.12 J/gK | Heat of atomization:kJ/mole atoms |
Heat of fusion:5.190 kJ/mol | Heat of vaporization : |
1st ionization energy:597 kJ/mole | 2nd ionization energy:kJ/mole |
3rd ionization energy:kJ/mole | Electron affinity:kJ/mole |
Neptunium Oxidation & Electrons
Shells:2,8,18,32,23,8,2 | Electron configuration:[Rn] 5f4 6d1 7s2 |
Minimum oxidation number:0 | Maximum oxidation number:7 |
Min. common oxidation no.:0 | Max. common oxidation no.:5 |
Electronegativity (Pauling Scale):1.3 | Polarizability volume:24.8 Å3 |
Neptunium Appearance & Characteristics
Structure:special: complex | Color:silvery |
Hardness:mohs | |
Harmful effects:
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Characteristics:
Radioactive Uses:
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Neptunium Reactions
Reaction with air: | Reaction with 6 M HCl: |
Reaction with 15 M HNO3: | Reaction with 6 M NaOH: |
Neptunium Compounds
Oxide(s):NpO NpO2 Np2O5 | Chloride(s):NpCl3 NpCl4 |
Hydride(s):NpH2 NpH3 |
Neptunium Radius
Atomic radius:155 pm | Ionic radius (1+ ion):pm |
Ionic radius (2+ ion):124 pm | Ionic radius (3+ ion):115 pm |
Ionic radius (2- ion):pm | Ionic radius (1- ion):pm |
Neptunium Conductivity
Thermal conductivity: 6.3 J/m-sec-deg | Electrical conductivity:1/mohm-cm |
Neptunium Abundance & Isotopes
Abundance earth's crust:log | |
Abundance solar system: log | |
Cost, pure:$/100g | |
Cost, bulk:$/100g | |
Source:
Synthetic |
|
Isotopes:
0 |
Neptunium Other
Other:
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