44Ru101.1
Ruthenium
Transition Metal
Solid at STP
Period 5Group 8Block DDiscovered 1827
[Kr]5s1 4d7
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.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 44 |
| Atomic Mass | 101.1 u |
| Electron Configuration | [Kr]5s1 4d7 |
| Oxidation States | +3 |
| Electronegativity | 2.2 (Pauling) |
| Atomic Radius | 207 pm |
| Ionization Energy | 7.361 eV |
| Electron Affinity | 1.05 eV |
| Block | D |
Physical Properties
| Appearance | silvery white metallic |
| Standard State | Solid |
| Melting Point | 2607 K (2333.8 °C) |
| Boiling Point | 4423 K (4149.9 °C) |
| Density | 12.1 g/cm³ |
| Molar Heat | 24.06 J/(mol·K) |
| CPK Color | #248F8F |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 5 |
| Group | 8 |
| Block | D |
Discovery
| Year Discovered | 1827 |
| Discovered By | Karl Ernst Claus |
| Electron Shells | 2, 8, 18, 15, 1 |