Ruthenium (Ru) - Element 44 | Properties & Electron Configuration
What is Ruthenium?
Ruthenium (Ru) is element 44, a transition metal in period 5, group 8. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁷ 5s¹.
| Atomic Number | 44 |
| Symbol | Ru |
| Atomic Mass | 101.07 u |
| Category | Transition Metal |
| Period | 5 |
| Group | 8 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁷ 5s¹ |
| Short Config | [Kr] 4d⁷ 5s¹ |
| Electronegativity | 2.2 |
| Atomic Radius | 134 pm |
| Ionization Energy | 710 kJ/mol |
| Electron Affinity | 101 kJ/mol |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Ruthenium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁷ 5s¹. In noble gas shorthand, this is written as [Kr] 4d⁷ 5s¹.
Ruthenium is a d-block element in group 8, period 5.
Periodic Trends
Electronegativity: Ruthenium has a Pauling electronegativity of 2.2. Within group 8, electronegativity generally decreases down the group.
Atomic Radius: 134 pm. Across period 5, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 710 kJ/mol. Ionization energy generally increases across a period and decreases down a group.
View all 118 elements with trend overlays for electronegativity, atomic radius, ionization energy, and electron affinity.
Explore Ruthenium on the Interactive Periodic TableRelated Topics
Iron (Fe)
Properties of Iron - same group as Ruthenium
Osmium (Os)
Properties of Osmium - same group as Ruthenium
Hassium (Hs)
Properties of Hassium - same group as Ruthenium
Rubidium (Rb)
Properties of Rubidium - same period as Ruthenium
Strontium (Sr)
Properties of Strontium - same period as Ruthenium
Yttrium (Y)
Properties of Yttrium - same period as Ruthenium