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Element Description

Tantalum is a gray, heavy, and very hard metal with a platinum-like color when polished. It is malleable, ductile, and can be readily drawn into fine wire with great strength. Tantalum is very resistant to chemical attack and has a high melting point, exceeded only by tungston and rhenium. Its properties combine well with other elements to make alloys with great strength, good ductility, and high melting points. Tantalum is used in bone and joint replacement because it is completely immune to body liquids and is nonirritating.

Property Name Property Value Property Name Property Value
Atomic Code (73Ta180.9479) First Ionization Energy 138K-cal/g-mole
CAS # 7440-25-7 Electronegativity 1.5Pauling's
Covalent Radius 1.34Angstroms
Melting Point 2996°C Electrical Resistivity @ 20°C 13.5µΩ-cm
Boiling Point 5429°C Crystal Structure Cubic, body centered
Density 16.69g/cm3 Thermionic Work Function 4.12eV
Themal Conductivity 0.130cal/cm2/cm/s/°C Thermal Neutron Cross Section 21.3barns/atom
Specific Heat @ 20°C 0.036cal/g°C Young's Modulus @ 20°C 27x106psi
Heat of Fusion 6.8k-cal/g-atom Magnetic Susceptibility 0.93x10-6cgs
Heat of Vaporization 180k-cal/g-atom Tensile Strength @ 20°C 35-70x103psi
Atomic Volume 10.9W/D


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