Precious Metal Elements

Rhodium[  Atomic number45  Atomic weight102.9055  ]

When solidified, cannot be melted by anything. Very hard element used for plating to create hard surfaces.

Rh Rhodium
Atomic number 45
Atomic weight 102.9055
Isotope 103Rh
Crystal Structure fcc
Metallicity Trans.Metal
Shell 2,8,18,16,1
Filling Orbital 4d8
Oxidation States 2,3,4
Atomic Radius Å 1.83
Covalent Radius Å 1.25
Atomic Volume cm3/mol 8.3
Density at 293K g/cm3 12.41
Melting Point 1960
Boiling Point 3697
Specific Heat J/gK 0.242
Heat of Fusion kJ/mol 21.50
Heat of Vaporization kJ/mol 493.0
Thermal Conductivity at 273K W/cmK 1.50
Specific Resistance at 273K 10-6 Ωcm 4.3
Coefficient of Linear expansion at 293K 10-6 K-1 8.2
Ionization Potential V 7.45890
2nd Ionization Potential V 18.08
Electron Affinity eV 1.137
Electronegativity 2.28
Discovery year 1803