Praseodymium (Pr)
Praseodymium
Praseodymium (Pr) is a lanthanide in period 6. Its relative atomic mass is 140.91 and the molar mass of the atom is 140.91 g/mol.
Atomic number 59
Atomic mass 140.91
Molar mass 140.91 g/mol
Category Lanthanide Solid
Properties of praseodymium
| Atomic number | 59 |
|---|---|
| Symbol | Pr |
| Latin name | Praseodymium |
| Relative atomic mass | 140.91 |
| Molar mass | 140.91 g/mol |
| Group, period, block | —, 6, f |
| Category | Lanthanide |
| State at 20 °C | Solid |
| Electron configuration | [Xe] 4f³ 6s² |
| Electronegativity (Pauling) | 1.13 |
| Atomic radius | 185 pm |
Electron configuration of praseodymium
Electrons per shell
K2L8M18N21O8P2
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f³ 5s² 5p⁶ 6s²
Noble-gas notation
59 protons · 59 electrons[Xe] 4f³ 6s²
Formula and compounds of praseodymium
Simple substancePrpraseodymiumMolar mass of Pr: 140.91 g/mol
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Frequently asked questions
The relative atomic mass of praseodymium is 140.91, so the molar mass of the atom is 140.91 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f³ 5s² 5p⁶ 6s². Noble-gas notation: [Xe] 4f³ 6s².