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Np
in WebElements
in X-Ray info
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Np, 93
neptunium (English)
neptunium, m. (French)
Neptunium, n. (German)
neptunij (Russian)
neptunium (Swedish)
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| Symbol, number | Np, 93 (metal) |
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| Weight | 237.0482 |
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| In Nature | Only synthetically prepared. |
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| Discovered | 1940, by Edwin M. McMillan och Philip Abelson (USA) |
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| Density [kg/m3] | 20250 [293 K] (solid) |
| Molar volume | 11.71 cm3 |
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| Melting Temperature | 913 K (640 °C) Enthalpy: 336.6 kJ/mol |
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| Boiling Temperature | 4175 K (3902 °C) Enthalpy: 9.46 kJ/mol |
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| Electrical resistance | 122E-8 [293 K] Wm |
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| Thermal | Conductivity: 6.3 [300 K] W/Km Expansion: 2.75E-6 /K |
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| Ionisation [kJ/mol] |
| M--> |
M+--> |
M2+--> |
M3+--> |
M4+--> |
M5+--> |
M6+--> |
M7+--> |
M8+--> |
M9+-->M10+ |
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| Thermodynamics |
| State |
DfH° |
DfG° |
S° |
CpH |
H°298.15-H°0 |
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[J/Kmol] |
[kJ/mol] |
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| Isotopes |
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Mass |
In nature |
Half-life |
Spin |
m/mN |
NMM |
Decay |
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