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Element Details

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THULIUM (69Tm168.9342)

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Element Description

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.

Property Name Property Value Property Name Property Value
Atomic Code (69Tm168.9342) Electronegativity 1.2Pauling's
CAS # 7440-30-4 Covalent Radius 1.56Angstroms
Electrical Resistivity @ 298°C 67.6µΩ-cm
Melting Point 1545°C Crystal Structure Hexagonal
Boiling Point 1725°C Compressibility 2.47x10-6cm2/kg
Density 9.32g/cm3 Thermal Neutron Cross Section 118barns/atom
Specific Heat @ 25°C 0.038cal/g°C Magnetic Moment 7.62Bohr magnetons
Heat of Fusion 4.4k-cal/g-atom Magnetic Susceptibility 26,000x10-6emu/mole
Heat of Vaporization 59k-cal/g-atom Standard Electrode Potential +2.1volts
Atomic Volume 18.1W/D

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