Thulium
Thulium
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Thulium ΒΆ
AtomicNumber: 69
Element: Thulium
Symbol: Tm
AtomicMass: 168.934
NumberofNeutrons: 100
NumberofProtons: 69
NumberofElectrons: 69
Period: 6
Group: nan
Phase: solid
Radioactive: nan
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Lanthanide
AtomicRadius: 2.4
Electronegativity: 1.25
FirstIonization: 6.1843
Density: 9.32
MeltingPoint: 1818.15
BoilingPoint: 2223.0
NumberOfIsotopes: 18.0
Discoverer: Cleve
Year: 1879.0
SpecificHeat: 0.16
NumberofShells: 6
NumberofValence: nan