Periodic Table
44
Ru
101.07
Ruthenium
Transition MetalCatalysis; config exception (4d⁷5s¹).
Electronic Configuration
[Kr] 4d⁷ 5s¹or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d⁷ 5s¹
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
15e⁻n=4
1e⁻n=5
Properties
Atomic number
44
Atomic mass
101.07 u
Category
Transition Metal
Block / Group / Period
d · 8 · 5
Valence electrons
1
Oxidation states
+2 to +8
Electronegativity
2.2
Atomic radius
178 pm
Ionization energy
710 kJ/mol
Electron affinity
101 kJ/mol
Melting point
2607 K / 2334 °C
Boiling point
4423 K / 4150 °C
Density
12.37 g/cm³
State at 25 °C
solid
Personal Notes
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