Stable isotope Ruthenium (Ru)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Enrichment Level Chemical Form
Ru-99 44 55 98.905939 12.7% >96.00% Metal
Ru-100 44 56 99.904219 12.6% >97.00% Metal
Ru-101 44 57 100.905581 17.0% >98.00% Metal
Ru-102 44 58 101.904349 31.6% >98.00% Metal
Ru-104 44 60 103.905429 18.7% ≥99.50 Metal

Properties of Ruthenium

Name Ruthenium
Symbol Ru
Atomic number 44
Atomic weight 101.07
Standard state Solid at 298 °K
CAS Registry ID 7440-18-8
Group in periodic table 8
Group name Precious metal or platinum group metal
Period in periodic table 5
Block in periodic table d-block
Color Silvery white metallic
Classification Metallic
Melting point 2334 °C
Boiling point 3900 °C
Thermal conductivity 117.0 W/(m·K) at 298.2 °K
Electrical resistivity 7.1 µΩ·cm at 0 °C
Electronegativity 2.2
Specific heat 0.24 kJ/kg K
Heat of vaporization 580 kJ·mol-1 at 3900 °C
Heat of fusion 25.7 kJ·mol-1
Density of liquid 10.65 g/cm3 at 2334 °C
Density of solid 12.37 g/cm3
Electron configuration [Kr]4d75s1
Oxidation states 0, +1, +2, +3, +4, +5, +6, +7, +8
Most stable oxidation states +2, +3, +4
Atomic radius 1.34 Å
Ionic radius Ru8+: 0.36 Å (coordination number 8)