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Thulium (69Tm168.9342)
[7440-30-4]

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Elemental Form

The least abundant of the rare earth elements, thulium occurs in small quantities along with other rare earths in many minerals. It is silvery-gray, soft, malleable, ductile, and can be cut with a knife. The pure metal is bright and lustrous and reasonable stable in air.
Melting Point1545°CBoiling Point1725°C
Density9.32g/cm3Specific Heat @ 25°C0.038cal/g°C
Heat of Fusion4.4k-cal/g-atomHeat of Vaporization59k-cal/g-atom
Atomic Volume18.1W/DElectronegativity1.2Pauling's
Covalent Radius1.56AngstromsElectrical Resistivity @ 298°C67.6µΩ-cm
Crystal StructureHexagonalCompressibility2.47x10-6cm2/kg
Thermal Neutron Cross Section118barns/atomMagnetic Moment7.62Bohr magnetons
Magnetic Susceptibility26,000x10-6emu/moleStandard Electrode Potential+2.1volts