Ruthenium
Symbol
Ru
Atomic Number
44
Atomic Weight
101.07
Element Classification
Discovered By
Karl Klaus
Discovery Date
1844 (Russia)
Name Origin
Latin: Ruthenia (Russia).
Density (g/cc)
12.41
Melting Point (K)
2583
Boiling Point (K)
4173
Appearance
Rare, silver-gray, extremely brittle metal
Atomic Radius (pm)
134
Atomic Volume (cc/mol)
8.3
Covalent Radius (pm)
125
Ionic Radius
67 (+4e)
Specific Heat
0.238
Fusion Heat (kJ/mol)
(25.5)
Evaporation Heat (kJ/mol)
n/a
Thermal Conductivity (@25°C W/m K)
117.0
Debye Temperature (K)
n/a
Pauling Negativity Number
2.2
First Ionizing Energy (kJ/mol)
710.3
Oxidation States
8, 6, 4, 3, 2, 0, -2
Electronic Configuration
[Kr] 4d7 5s1
Lattice Structure
Hexagonal(HEX)
Lattice Constant
2.700
Lattice C/A Ratio
1.584
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