59140.91PrPraseodymium
Praseodymium (Pr) — element 59lanthanide · period 6
Praseodymium is a chemical element with the symbol Pr and atomic number 59. It is a lanthanide in period 6 of the periodic table (the f-block), with a standard atomic mass of 140.91 u. At room temperature (25 °C) praseodymium is a solid.
💡 Known for: Used with neodymium in powerful magnets and to tint glass for welders' goggles.
# Praseodymium properties
| Symbol | Pr |
|---|---|
| Atomic number | 59 |
| Atomic mass | 140.91 u |
| Category | lanthanide |
| Group | — (f-block, no group number) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 4f³ 6s² |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f³ 5s² 5p⁶ 6s² |
| Electrons per shell | 2, 8, 18, 21, 8, 2 |
| Protons / electrons | 59 / 59 |
| State at 25 °C | solid |
| Melting point | 1208 K (934.9 °C, 1714.7 °F) |
| Boiling point | 3793 K (3519.8 °C, 6367.7 °F) |
| Density | 6.773 g/cm³ |
| Electronegativity (Pauling) | 1.13 |
| First ionization energy | 5.473 eV |
| Atomic radius | 247 pm |
| Discovered | 1885 |
# Electron configuration of praseodymium
The electron configuration of praseodymium is [Xe] 4f³ 6s², written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f³ 5s² 5p⁶ 6s². Its 59 electrons fill 6 shells as 2, 8, 18, 21, 8, 2, so the outermost shell holds 2 electrons.
# Related elements
CeCeriumprevious elementNdNeodymiumnext elementLaLanthanumlanthanidePmPromethiumlanthanideSmSamariumlanthanideEuEuropiumlanthanideGdGadoliniumlanthanideTbTerbiumlanthanideDyDysprosiumlanthanideHoHolmiumlanthanide
# Praseodymium FAQ
What is the atomic number of praseodymium?
The atomic number of praseodymium is 59: every praseodymium atom has 59 protons in its nucleus. Its symbol is Pr.
What is the atomic mass of praseodymium?
The standard atomic mass of praseodymium is 140.91 u.
What is the electron configuration of praseodymium?
Praseodymium's electron configuration is [Xe] 4f³ 6s² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f³ 5s² 5p⁶ 6s²), with 2, 8, 18, 21, 8, 2 electrons per shell.
Is praseodymium a metal?
Yes. Praseodymium is a lanthanide, one of the metals.
What is the melting point of praseodymium?
Praseodymium melts at 1208 K (934.9 °C, 1714.7 °F) and boils at 3793 K (3519.8 °C, 6367.7 °F).
What is praseodymium used for / known for?
Used with neodymium in powerful magnets and to tint glass for welders' goggles.