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Platinum (₇₈Pt^195.08)
[7440-06-4]

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Elemental Form


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