Thorium
Thorium
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Thorium ΒΆ
AtomicNumber: 90
Element: Thorium
Symbol: Th
AtomicMass: 232.038
NumberofNeutrons: 142
NumberofProtons: 90
NumberofElectrons: 90
Period: 7
Group: nan
Phase: solid
Radioactive: yes
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Actinide
AtomicRadius: nan
Electronegativity: 1.3
FirstIonization: 6.3067
Density: 11.7
MeltingPoint: 2028.15
BoilingPoint: 5061.0
NumberOfIsotopes: 12.0
Discoverer: Berzelius
Year: 1828.0
SpecificHeat: 0.113
NumberofShells: 7
NumberofValence: nan