Promethium (Pm) Properties |
APromethium (APm)
Properties 1/ |
Nuclear (61 protons/electrons)
- Atomic Number: 61
- Atomic Mass: 145
- Atomic Energy: 0.216 Ergs
- Group: 3; Period: 6
- Family: Rare Earth:
Lanthanide Series
- Bonding Radius: 1.63 Angstroms
- Atomic Radius: 2.62 Angstroms
- Atomic Volume: 22.39 cm3mol-1
- 36
Isotopes: 128APm to 163APm
- Stable Isotopes: None
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Nuclear (61 Aprotons/positrons)
- Atomic Number: 61
- Atomic Mass: 145
- Atomic Energy: 0.216 Ergs
- Group: 3; Period: 6
- Family: Rare Earth:
Lanthanide Series
- Bonding Radius: 1.63 Angstroms
- Atomic Radius: 2.62 Angstroms
- Atomic Volume: 22.39 cm3mol-1
- 36 AIsotopes: 128APm
to 163APm
- Stable AIsotopes: none
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Physical
- Radioactive earth metal
- Density: 6.47 g cm-3
- Melting Point: ? oC
- Boiling Point: ? oC
- Specific Heat: 0.18 J g-1 K-1
- Heat of Vaporization: ? kJ mol-1
- Heat of Fusion: ? kJ mol-1
- Electrical Conductivity: ? 106 cm-1 Ohm-1
- Thermal Conductivity: 0.179 W cm-1 K-1
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Physical
- Radioactive metal
- Density: 6.47 g/cm-3
- Melting Point: ? oC
- Boiling Point: ? oC
- Specific Heat: 0.18 J g-1 K-1
- Heat of Vaporization: ? kJ mol-1
- Heat of Fusion: ? kJ mol-1
- Electrical Conductivity: ? 106 cm-1 Ohm-1
- Thermal Conductivity: 0.179 W cm-1 K-1
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Chemical
- Valance Number: +3
- Electron Configuration: 2,8,18,23,8,2
- Electronegativity: 1.13
- 1st Ionization Potential: 5.6 Volts
- 2nd Ionization Potential: 10.9 Volts
- 3rd Ionization Potential: 22.3 Volts
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Chemical
- Valance Number: -3
- Positron Configuration: 2,8,18,23,8,2
- Positronpositivity: 1.13
- 1st Ionization Potential: 5.6 Volts
- 2nd Ionization Potential: 10.9 Volts
- 3rd Ionization Potential: 22.3 Volts
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Identified by J. A. Marinsky,
L. E.
Glendenin, and C. D. Coryell,
United States in 1945
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Identified by Norm Hansen in 2001
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