Thorium (Th) Properties |
AThorium (ATh)
Properties 1/ |
Nuclear (90 protons/electrons)
- Atomic Number: 90
- Atomic Mass: 232.038
- Atomic Energy: 0.346 Ergs
- Group: 3; Period: 7
- Family: Rare Earth:
Actinide Series
- Bonding Radius: 1.65 Angstroms
- Atomic Radius: ? Angstroms
- Atomic Volume: 19.9 cm3mol-1
- 29 Isotopes:
210Th
to 238Th
- Stable Isotopes: 232Th
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Nuclear (90 Aprotons/positrons)
- Atomic Number: 90
- Atomic Mass: 232.038
- Atomic Energy: 0.346 Ergs
- Group: 3; Period: 7
- Family: Rare Earth:
Actinide Series
- Bonding Radius: 1.65 Angstroms
- Atomic Radius: ? Angstroms
- Atomic Volume: 19.9 cm3mol-1
- 29 AIsotopes: 210ATh
to 238ATh
- Stable AIsotopes:
232ATh
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Physical
- Soft silvery radioactive metal
- Density: 11.7 g cm-3
- Melting Point: 1,750 oC
- Boiling Point: 4,790 oC
- Specific Heat: 0.12 J g-1 K-1
- Heat of Vaporization: 514 kJ mol-1
- Heat of Fusion: 16.1 kJ mol-1
- Electrical Conductivity: 0.0653 106 cm-1 Ohm-1
- Thermal Conductivity: 0.540 W cm-1 K-1
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Physical
- Soft silvery radioactive metal
- Density: 11.7 g/cm-3
- Melting Point: 1,750 oC
- Boiling Point: 4,790 oC
- Specific Heat: 0.12 J g-1 K-1
- Heat of Vaporization: 514 kJ mol-1
- Heat of Fusion: 16.1 kJ mol-1
- Electrical Conductivity: 0.0653 106 cm-1 Ohm-1
- Thermal Conductivity: 0.540 W cm-1 K-1
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Chemical
- Valance Number: +4
- Electron Configuration: 2,8,18,32,18,10,2
- Electronegativity: 1.3
- 1st Ionization Potential: 6.1 Volts
- 2nd Ionization Potential: 11.5 Volts
- 3rd Ionization Potential: 20.0 Volts
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Chemical
- Valance Number: -4
- Positron Configuration: 2,8,18,32,18,10,2
- Positronpositivity: 1.3
- 1st Ionization Potential: 6.1 Volts
- 2nd Ionization Potential: 11.5 Volts
- 3rd Ionization Potential: 20.0 Volts
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Identified by Jons Berzelius
Sweden in 1828
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Identified by Norm Hansen in 2001
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