| PALLADIUM |
Name, Symbol, Number palladium, Pd, 46
Chemical series transition metals
Group, Period, Block 10, 5, d
Appearance silvery white metallic
Atomic mass 106.42(1) g/mol
Electron configuration [Kr] 4d10
Electrons per shell 2, 8, 18, 18
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Density (near r.t.) 12.023 g/cm³
Liquid density at m.p. 10.38 g/cm³
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
Heat of vaporization 362 kJ/mol
Heat capacity (25 °C) 25.98 J/(mol·K)
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k
at T/K 1721 1897 2117 2395 2753 3234
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Crystal structure cubic face centered
Oxidation states ±1
(mildly basic oxide)
Electronegativity 2.20 (Pauling scale)
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
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Magnetic ordering no data
Electrical resistivity (20 °C) 105.4 nO·m
Thermal conductivity (300 K) 71.8 W/(m·K)
Thermal expansion (25 °C) 11.8 µm/(m·K)
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
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