Thulium
Symbol: Tm
Atomic Number: 69
Atomic Weight: 168.9342
Boiling Point: 2223 K
Melting Point: 1818 K
Density at 300 K: 9.32 g/cm3
Covalent radius: 1.56
Atomic radius: 2.42
Atomic volume: 18.1 cm3/mol
First ionization potental: 6.184 V
Specific heat capacity: 0.16 J g-1 K-1
Thermal conductivity: 16.8 W m-1 K-1
Electrical conductivity: 1.3*106 Ω-1 m-1
Heat of fusion: 16.8 kJ/mol
Heat of vaporization: 191 kJ/mol
Electronegativity: 1.25 (Pauling's)

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Thu"li*um (?), n. [NL. See Thule.] Chem.

A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.

 

© Webster 1913.

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