Neptumium (Np) Properties |
ANeptumium (ANp)
Properties 1/ |
Nuclear (93 protons/electrons)
- Atomic Number: 93
- Atomic Mass: 237.05
- Atomic Energy: 0.354 Ergs
- Group: 3; Period: 7
- Family: Rare Earth:
Actinide Series
- Bonding Radius: ? Angstroms
- Atomic Radius: ? Angstroms
- Atomic Volume: 11.62 cm3mol-1
- 20 Isotopes:
225ANp to 244ANp
- Stable Isotopes: None
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Nuclear (93 Aprotons/positrons)
- Atomic Number: 93
- Atomic Mass: 237.05
- Atomic Energy: 0.354 Ergs
- Group: 3; Period: 7
- Family: Rare Earth:
Actinide Series
- Bonding Radius: ? Angstroms
- Atomic Radius: ? Angstroms
- Atomic Volume: 11.62 cm3mol-1
- 20 AIsotopes: 225ANp
to 244ANp
- Stable AIsotopes: None
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Physical
- Man-made radioactive metal
- Density: 20.25 g cm-3
- Melting Point: 640 oC
- Boiling Point: 3,902 oC
- Specific Heat: 0.12 J g-1 K-1
- Heat of Vaporization: ? kJ mol-1
- Heat of Fusion: 5.19 kJ mol-1
- Electrical Conductivity: 0.00822 106 cm-1 Ohm-1
- Thermal Conductivity: 0.063 W cm-1 K-1
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Physical
- Radioactive metal
- Density: 20.3 g/cm-3
- Melting Point: 640 oC
- Boiling Point: 3,902 oC
- Specific Heat: 0.12 J g-1 K-1
- Heat of Vaporization: ? kJ mol-1
- Heat of Fusion: 5.19 kJ mol-1
- Electrical Conductivity: 0.00822 106 cm-1 Ohm-1
- Thermal Conductivity: 0.063 W cm-1 K-1
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Chemical
- Valance Number: +3, +4, +5, +6
- Electron Configuration: 2,8,18,32,22,9,2
- Electronegativity: 1.36
- 1st Ionization Potential: 6.2 Volts
- 2nd Ionization Potential: ? Volts
- 3rd Ionization Potential: ? Volts
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Chemical
- Valance Number: -3, -4, -5, -6
- Positron Configuration: 2,8,18,32,22,9,2
- Positronpositivity: 1.36
- 1st Ionization Potential: 6.2 Volts
- 2nd Ionization Potential: ? Volts
- 3rd Ionization Potential: ? Volts
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Identified by E. M. McMillan, P. H.
Abelson
United States in 1940
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Identified by Norm Hansen in 2001
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