59 Pr 140.91
Praseodymium
Lanthanide
Praseodymium (Pr) is a chemical element with atomic number 59, classified as a lanthanide. At room temperature it is a solid. It was discovered in 1885 by Carl Auer von Welsbach.
Properties
- Atomic number
- 59
- Atomic mass
- 140.91 u
- Category
- Lanthanide
- Group
- 0
- Period
- 6
- Block
- f-block
- Electron configuration
- [Xe] 4f³ 6s²
- Phase at STP
- Solid
- Density
- 6.773 g/cm³
- Melting point
- 1208 K (934.9 °C)
- Boiling point
- 3793 K (3519.8 °C)
- Electronegativity
- 1.13
- Atomic radius
- 247 pm
- Ionization energy
- 5.473 eV
- Discovery
- 1885 · Carl Auer von Welsbach
Common uses
Magnets, lasers, arc lighting, glass coloring
Did you know?
Creates brilliant green color and used in aircraft engines.