Palladium

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Other names/abbreviations:

Pd

Element no:	46
Element group:	10 (IUPAC) VIII B (American labelling) VIII A (European labelling)
Element type:	Transition metals
CAS-Number:	7440-05-3
EINECS-Number:	231-115-6

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Symbol: -
R-phrases: -
S-phrases: -

Physical properties

Appearance
	Physical state @ 20°C:	Solid [3]
	Color:	Gray [3]
	Odor:	Odourless [3]

Bulk properties
	Molecular weight (g/mol):	106.42(1) [1]
	Melting point (°C):	1552 [1]
	Boiling point (°C):	2940 [1]
	Density (g/cm3):	11.99 [1]
	Molar volume (cm3):	8.87 (20 °C) [2]
	Elastic properties: Young's modulus (GPa): Rigidity modulus (GPa): Bulk modulus (GPa): Poisson ratio:	121-124 [2] 47-49 [2] 187 [2] 0.39 [2]

Thermodynamic properties
	ΔfH°gas (kJ/mol):	377±3 (Monoatomic) [1] 378.2 [4]
	ΔfH°solid (kJ/mol):	0.0 [4]
	ΔH°fusion (kJ/mol):	16.74 [4]
	ΔH°vaporization (kJ/mol):	362±11 [1]
	S°gas (J/K·mol):	167.1 [4]
	S°solid (J/K·mol):	37.6 [4]
	ΔfG°gas (kJ/mol):	339.7 [4]
	Cp (gas) (J/K·mol):	20.8 (25 °C) [4]
	Cp (solid) (J/K·mol):	25.7453 (20 °C) [2] 25.98 (25 °C) [4] 26.1462 (100 °C) [2] 28.3733 (500 °C) [2] 31.4467 (1000 °C) [2]
	Coeff. of linear thermal expansion (106 K-1):	11.0 (20 °C) [2] 11.8 (25 °C) [4] 11.1 (100 °C) [2] 12.4 (500 °C) [2] 13.6 (1000 °C) [2]

Crystal structure
	Crystal type:	Face centered cubic [2]

Electronic properties
	Electron configuration:	1s2-2s2-2p6-3s2-3p6-3d10-4s2-4p6-4d10
	Ionic radius (Å):	Pd(IV): 0.615 (6-coordinate) [1] Pd(III): 0.76 (6-coordinate) [1] Pd(II): 0.86 (6-coordinate) [1]

Conductivity
	Electrical resisitvity (μΩ·cm):	10.80 (20 °C) [2] 10.50 (25 °C) [2] 13.8 (100 °C) [2] 27.5 (500 °C) [2] 40 (1000 °C) [2]
	Thermal (W/m·K):	75 (10 °C) [2] 71.8 (27 °C) [4] 74 (100 °C) [2]

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: Merck. ChemDAT The Merck Chemical Database Ver. 1.1.5

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

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© Michael Pilgaard
Created: October 6, 2008
Last update: October 9, 2008