Precious Metal Elements

Ruthenium[  Atomic number44  Atomic weight101.07  ]

Used as an optical catalyst to reduce water to hydrogen. Enables increased storage capacity for hard disks.

Ru Ruthenium
Atomic number 44
Atomic weight 101.07
Isotope 96Ru, 98Ru, 99Ru, 100Ru, 101Ru, 102Ru, 104Ru
Crystal Structure hcp (c/a<1.63)
Metallicity Trans.Metal
Shell 2,8,18,15,1
Filling Orbital 4d7
Oxidation States 2,3,4,6,8
Atomic Radius Å 1.33
Covalent Radius Å 1.25
Atomic Volume cm3/mol 8.3
Density at 293K g/cm3 12.41
Melting Point 2250
Boiling Point 4155
Specific Heat J/gK 0.238
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 7.6
Coefficient of Linear expansion at 293K 10-6 K-1 8.2
Ionization Potential V 7.36050
2nd Ionization Potential V 16.76
Electron Affinity eV 1.05
Electronegativity 2.2
Discovery year 1844