45Rh102.9055
Rhodium
Transition Metal
Solid at STP
Period 5Group 9Block DDiscovered 1803
[Kr]5s1 4d8
Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, and chemically inert transition metal. It is a member of the platinum group.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 45 |
| Atomic Mass | 102.9055 u |
| Electron Configuration | [Kr]5s1 4d8 |
| Oxidation States | +3 |
| Electronegativity | 2.28 (Pauling) |
| Atomic Radius | 195 pm |
| Ionization Energy | 7.459 eV |
| Electron Affinity | 1.137 eV |
| Block | D |
Physical Properties
| Appearance | silvery white metallic |
| Standard State | Solid |
| Melting Point | 2237 K (1963.8 °C) |
| Boiling Point | 3968 K (3694.8 °C) |
| Density | 12.4 g/cm³ |
| Molar Heat | 24.98 J/(mol·K) |
| CPK Color | #0A7D8C |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 5 |
| Group | 9 |
| Block | D |
Discovery
| Year Discovered | 1803 |
| Discovered By | William Hyde Wollaston |
| Electron Shells | 2, 8, 18, 16, 1 |