44Ru101.072
Transition Metald-block
Ruthenium
Element 44 on the periodic table, symbol Ru, group 8, period 5.
Ruthenium is a chemical element with symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Like the other metals of the platinum group, ruthenium is inert to most other chemicals.
Appearance: silvery white metallic
Properties
- Atomic Number
- 44
- Atomic Mass
- 101.0720 u
- Group
- 8
- Period
- 5
- Block
- d-block
- Category
- Transition Metal
- State at 25 °C
- Solid
- Melting Point
- 2,607 K · 2,333.9 °C
- Boiling Point
- 4,423 K · 4,149.9 °C
- Density
- 12.45 g/cm³
- Atomic Radius
- 130 pm
- Electronegativity
- 2.2
- Oxidation States
- +3, +4
- Abundance in Crust
- 0.001 mg/kg
- Discovered
- 1844
- Discovered By
- Karl Ernst Claus
Electron Configuration
[Kr] 4d7 5s1
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d7
Ionisation Energies (kJ/mol)
- 1. 710.2
- 2. 1,620
- 3. 2,747
Elements near Ruthenium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.