59Pr140.90766
Praseodymium
Lanthanide
Solid at STP
Period 6Block FDiscovered 1885
[Xe]6s2 4f3
Praseodymium is a chemical element with symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is valued for its magnetic, electrical, chemical, and optical properties.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 59 |
| Atomic Mass | 140.90766 u |
| Electron Configuration | [Xe]6s2 4f3 |
| Oxidation States | +3 |
| Electronegativity | 1.13 (Pauling) |
| Atomic Radius | 239 pm |
| Ionization Energy | 5.464 eV |
| Block | F |
Physical Properties
| Appearance | grayish white |
| Standard State | Solid |
| Melting Point | 1204 K (930.9 °C) |
| Boiling Point | 3793 K (3519.8 °C) |
| Density | 6.77 g/cm³ |
| Molar Heat | 27.2 J/(mol·K) |
| CPK Color | #D9FFC7 |
Classification
| Category | Lanthanide |
| Group Block | Lanthanide |
| Period | 6 |
| Block | F |
Discovery
| Year Discovered | 1885 |
| Discovered By | Carl Auer von Welsbach |
| Electron Shells | 2, 8, 18, 21, 8, 2 |