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Thulium


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Other names/abbreviations: Tm



Element no: 69
Element group: Lanthanides
Element type: Inner transition metals
CAS-Number: 7440-30-4
EINECS-Number: 231-140-2



Physical properties

Appearance

Physical state @ 20°C: Solid
Color: Silvery white


Bulk properties

Molecular weight (g/mol): 168.93421 [1]
Melting point (°C): 1545 [1]
Boiling point (°C): 1950 [1]
Density (g/cm3): 9.321 [1]
Molar volume (cm3): 18.1 (20 °C) [2]
Elastic properties:
Young's modulus (GPa):
Rigidity modulus (GPa):
Bulk modulus (GPa):
Poissons ratio:
74.0 [2]
30.5 [2]
44.5 [2]
0.213 [2]


Thermodynamic properties

Δ H°atomization (kJ/mol): 232 [1]
ΔfH°gas (kJ/mol): 232.2 [3]
ΔfH°solid (kJ/mol): 0.0 [3]
ΔH°fusion (kJ/mol): 16.84 [3]
ΔH°vaporization (kJ/mol): 247 [1]


S°gas (J/K·mol): 190.1 [3]
S°solid (J/K·mol): 74.0 [3]


ΔfG°gas (kJ/mol): 197.5 [3]


Cp (gas) (J/K·mol): 20.8 (25 °C) [3]
Cp (solid) (J/K·mol): 27.03 (25 °C) [3]


Coeff. of linear thermal expansion (106 K-1): 13.3 (25 °C) [3]


Crystal structure

Crystal type: HCP [2]


Electronic properties

Electron configuration: 1s2-2s2-2p6-3s2-3p6-3d10-4s2-4p6-4d10-4f13-5s2-5p6-6s2
Ionic radius (Å): Tm(III): 0.880 (6-coordinate) [1]
Tm(II): 1.03 (6-coordinate) [1]


Conductivity

e°(V): Tm(III)/Tm(II): -2.3 [1]
Tm(III)/Tm: -2.32 [1]
Electrical resisitvity (μΩ·cm): 90 (20 °C) [2]
107 (25 °C) [2]
Thermal (W/m·K): 16.9 (27 °C) [3]



References

1: Greenwood,N.N., Earnshaw,A. Chemistry of the elements
2nd edition (1997) Edited by Greenwood,N.N., Earnshaw,A. pp. 1-1340, Butterworth-Heinemann. Oxford. Great Britain

2: Buch,A. Pure Metals Properties. A Scientific-Technical Handbook
1st edition (1999) Edited by Buch,A. pp. 1-306, ASM International and Freund Publishing House Ltd. Ohio. USA

3: CRC Handbook of Chemistry and Physics
75th edition (1994) Edited by Lide,D.R. , CRC Press Inc. Boca Raton, USA







© Michael Pilgaard
Created: October 7, 2008