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Pm
in WebElements
in X-Ray info
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Pm, 61
promethium (English)
prométhium, m. (French)
Promethium, n. (German)
prometij (Russian)
prometium (Swedish)
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| Symbol, number | Pm, 61 (metal) |
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| Weight | 145 |
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| In Nature | Only synthetically prepared. |
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| Discovered | 1945, by J.A. Marinsky, L.E. Glendheim and C.D. Coryell (USA) |
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| Density [kg/m3] | 7220 [298 K] (solid) |
| Molar volume | 20.1 cm3 |
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| Melting Temperature | 1441 K (1168 °C) |
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| Boiling Temperature | 3000 K (2727 °C) Enthalpy: 12.6 kJ/mol |
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| Electrical resistance | 50E-8 [273 K] Wm |
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| Thermal | Conductivity: 17.9 [300 K] (calc.) W/Km |
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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 |
| [kJ/mol] |
[J/Kmol] |
[kJ/mol] |
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| Isotopes |
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Mass |
In nature |
Half-life |
Spin |
m/mN |
NMM |
Decay |
| Pm |
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