Pilgaard Solutions

Scandium


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Other names/abbreviations: Sc
Ekaboron
Eb



Element no: 21
Element group: 3 (IUPAC)
III B (American labelling)
III A (European labelling)
Element type: Transition metals
CAS-Number: 7440-20-2
EINECS-Number: 231-129-2



Physical properties

Appearance

Physical state @ 20°C: Solid [1]
Color: Silvery-white [1]


Bulk properties

Molecular weight (g/mol): 44.955910(9) [1]
Melting point (°C): 1539 [1]
Boiling point (°C): 2748 [1]
Density (g/cm3): 3.0 [1]
Molar volume (cm3): 18.00 (20°C) [2]
Elastic properties:
Young's modulus (GPa):
Rigidity modulus (GPa):
Bulk modulus (GPa):
Poissons ratio:
74.5 [2]
29 [2]
56 [2]
0.28 [2]


Thermodynamic properties

ΔfH°gas (kJ/mol): 376±20 (monoatomic) [1]
377.8 [3]
ΔfH°solid (kJ/mol): 0.0 [3]
ΔH°fusion (kJ/mol): 15.77 [1]
14.10 [3]
ΔH°vaporization (kJ/mol): 332.71 [1]


S°gas (J/K·mol): 174.8 [3]
S°solid (J/K·mol): 34.6 [3]


ΔfG°gas (kJ/mol): 336.0 [3]


Cp (gas) (J/K·mol): 22.1 (25 °C) [3]
Cp (solid) (J/K·mol): 25.52 (25 °C) [3]


Coeff. of linear thermal expansion (106 K-1): 10.2 (25 °C) [3]


Crystal structure

Crystal type: HCP [2]


Electronic properties

Electron configuration: 1s2-2s2-2p6-3s2-3p6-3d1-4s2
Ionic radius (Å): 0.745 (6-coordinate) [1]


Conductivity

e°(V): Sc(III)/Sc: -2.03 [1]
Electrical resisitvity (μΩ·cm): 66.00 (20 °C) [2]
Thermal (W/m·K): 15.8 (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 6, 2008