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Element Description

Platinum is a silvery-white, lustrous metal that is malleable and ductile when pure. It has magnetic properties when combined with cobalt. Platinum metal occurs in nature contaminated with small amounts of all the platinum group metals; iridium, osmium, palladium, ruthenium, and rhodium. It does not corrode or tarnish in air and is not affected by water. In its finely divided form, platinum is an excellent catalyst. Similar to palladium, platinum absorbs large volumes of hydrogen.

Property Name Property Value Property Name Property Value
Atomic Code (78Pt195.08) First Ionization Energy 207K-cal/g-mole
CAS # 7440-06-4 Electronegativity 2.2Pauling's
Covalent Radius 1.30Angstroms
Melting Point 1768.4°C Vickers Hardness (annealed) 38-40
Boiling Point 3825°C Linear Coefficient of Expansion 9.1x10-6K-1
Density 21.45g/cm3 Electrical Resistivity @ 20°C 9.85µΩ-cm
Specific Heat @ 0°C 0.0314cal/g°C Crystal Structure Cubic, face centered
Heat of Fusion 4.7k-cal/g-atom Poisson Ratio 0.39
Heat of Vaporization 122k-cal/g-atom Young's Modulus of Elasticity 24.8x106psi
Atomic Volume 9.10W/D Tensile Strength (annealed) 20,000psi


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