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Reference


Palladium
Chemical Properties & Compounds



Symbol Atomic Number Atomic Weight Melting Point Boiling Point Phase Density Classification
Pd 46 106.42 1554.9 °C 2963 °C Solid 12.023 g/cm3 Noble Metal


46 rhodium ← palladium → silver
Ni
↑
Pd
↓
Pt
General
Name, Symbol, Number palladium, Pd, 46
Chemical series transition metals
Group, Period, Block 10, 5, d
Appearance silvery white metallic
Standard atomic weight 106.42(1)  g·mol−1
Electron configuration [Kr] 4d10
Electrons per shell 2, 8, 18, 18, 0
Physical properties
Phase solid
Density (near r.t.) 12.023  g·cm−3
Liquid density at m.p. 10.38  g·cm−3
Melting point 1828.05 K
(1554.9 °C, 2830.82 °F)
Boiling point 3236 K
(2963 °C, 5365 °F)
Heat of fusion 16.74  kJ·mol−1
Heat of vaporization 362  kJ·mol−1
Heat capacity (25 °C) 25.98  J·mol−1·K−1
Vapor pressure
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 1721 1897 2117 2395 2753 3234
Atomic properties
Crystal structure cubic face centered
Oxidation states 2, 4
(mildly basic oxide)
Electronegativity 2.20 (scale Pauling)
Ionization energies 1st: 804.4 kJ/mol
2nd: 1870 kJ/mol
3rd: 3177 kJ/mol
Atomic radius 140  pm
Atomic radius (calc.) 169  pm
Covalent radius 131  pm
Van der Waals radius 163 pm
Miscellaneous
Magnetic ordering no data
Electrical resistivity (20 °C) 105.4 n Ω·m
Thermal conductivity (300 K) 71.8  W·m−1·K−1
Thermal expansion (25 °C) 11.8  µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 3070 m/s
Young's modulus 121  GPa
Shear modulus 44  GPa
Bulk modulus 180  GPa
Poisson ratio 0.39
Mohs hardness 4.75
Vickers hardness 461  MPa
Brinell hardness 37.3  MPa
CAS registry number 7440-05-3
Selected isotopes
Main article: Isotopes of palladium
iso NA half-life DM DE (MeV) DP
100Pd syn 3.63 d ε - 107Rh
γ 0.084, 0.074,
0.126		 -
102Pd 1.02% Pd is stable with 56 neutrons
103Pd syn 16.991 d ε - 103Rh
104Pd 11.14% Pd is stable with 58 neutrons
105Pd 22.33% Pd is stable with 59 neutrons
106Pd 27.33% Pd is stable with 60 neutrons
107Pd syn 6.5×106 y β- 0.033 107Ag
108Pd 26.46% Pd is stable with 62 neutrons
110Pd 11.72% Pd is stable with 64 neutrons
References
Palladium Compounds

Source: Wikipedia article Palladium


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Last updated: October 2007

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