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OSMIUM (76Os190.23)

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One of the platinum group metals, osmium is bluish-white, lustrous, extremely hard and brittle. Its properties make it ideal for combining with other platinum metals to produce very hard alloys. Osmium has the highest melting point and lowest vapor pressure of the platinum group and it is very difficult to fabricate. While osmium powder or sponge is affected by air at room temperature, the metal is relatively inert in ambient conditions.

Property Name Property Value Property Name Property Value
Atomic Code (76Os190.23) First Ionization Energy 201K-cal/g-mole
CAS # 7440-04-2 Electronegativity 2.2Pauling's
Covalent Radius 1.26Angstroms
Melting Point 3045°C Vickers Hardness (annealed) 400
Boiling Point 5027°C Linear Coefficient of Expansion 6.1x10-6K-1
Density 22.61g/cm3 Electrical Resistivity 8.12µΩ-cm
Themal Conductivity 0.205cal/cm2/cm/s/°C Crystal Structure Hexagonal
Themal Conductivity @ 0°C 0.031cal/g Thermal Neutron Cross Section 15.3Gauss
Heat of Fusion 6.4k-cal/g-atom Young's Modulus of Elasticity 81x106psi
Heat of Vaporization 162k-cal/g-atom Magnetic Susceptibility 0.074x10-6cgs
Atomic Volume 8.43W/D Ionization Potential 8.7volts


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