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Element Description

An element belonging to the platinum group of metals, palladium is steel-white in color, except in powder form, when it appears black. Palladium resists tarnishing in air and, if annealed, it is soft and ductile. Palladium has the lowest density and melting point of the palladium metals and is the most reactive. At room temperature, palladium absorbs up to 900 times its own volume of hydrogen.

Property Name Property Value Property Name Property Value
Atomic Code (46Pd106.42) Electronegativity 2.2Pauling's
CAS # 7440-05-3 Covalent Radius 1.28Angstroms
Vickers Hardness (annealed) 37-39
Melting Point 1554.9°C Linear Coefficient of Expansion 11.6x10-6K-1
Boiling Point 3167°C Electrical Resistivity @ 20°C 9.93µΩ-cm
Density 12.02g/cm3 Crystal Structure Cubic, face centered
Themal Conductivity @ 18°C 1.68cal/cm2/cm/s/°C Work Function 4.99eV
Specific Heat @ 0°C 0.058cal/g°C Vapor Pressure @ M.P. 26mmHg
Heat of Fusion 4.0k-cal/g-atom Poisson Ratio 0.39
Heat of Vaporization 90k-cal/g-atom Young's Modulus of Elasticity 17x106psi
Atomic Volume 8.9W/D Magnetic Susceptibility 5.8x10-6cgs
First Ionization Energy 192K-cal/g-mole Tensile Strength (annealed) 33,000psi


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