44
101.07
Ru
Ruthenium
Identification
CAS Number: 7440-18-8
Discovery Year: 1844
Discoverer: Karl Klaus
Discovery Location: Russia
Properties
Atomic Dimensions
Atomic Radius: 130 pm →
Atomic Radius (Rahm): 237 pm
Covalent Radius: 146 pm →Van der Waals Radius: 213 pm
Metallic Radius: 125 pm
Atomic Volume: 8.3 cm³/mol
Lattice Constant: 2.7 Å
Thermodynamics
Electronic Structure
Electron Config: [Kr] 4d7 5s
Block: d
Period: 5 →Group: 8 →Electronegativity: 2.2 →Electron Affinity: 1.05 eV →Oxidation States: +2, +3, +4, +6, +8
Abundance & Geochemistry
Crust Abundance: 0.001 mg/kg
Sea Abundance: 7e-7 mg/L
Geochemical Class: noble metal
Goldschmidt Class: siderophile
About
Hard white metallic transition element. Found with platinum, used as a catalyst in some platinum alloys. Dissolves in fused alkalis, and is not attacked by acids. Reacts with halogens and oxygen at high temperatures. Isolated in 1844 by K.K. Klaus.
Isotopes
Ru-102 102 31.55%
Ru-104 104 18.62%
Ru-101 101 17.06%
Ru-99 99 12.76%
Ru-100 100 12.60%
Ru-96 96 5.54%
Ru-98 98 1.87%
