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59Pr140.907
Praseodymium
LanthanidesBlock fPeriod 6solid at 20 °C
- Configuration :
- [Xe] 4f³ 6s²
- Atomic mass :
- 140.90766 u
- French :
- Praséodyme
3D Bohr-model representation of the Praseodymium atom (symbol Pr, atomic number Z=59). Electron shell configuration: 2, 8, 18, 21, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f³ 6s²
Short[Xe] 4f³ 6s²
Valence electrons3
KLMNOPQ shells
K2
L8
M18
N21
O8
P2
Electronegativity
Pauling1.13
Allen—
Mulliken (eV)—
Atomic radii
Empirical185 pm
Calculated247 pm
Covalent203 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+399 pm
Successive ionisation energies
I₁527 kJ/mol
I₂1020 kJ/mol
I₃2086 kJ/mol
I₄3761 kJ/mol
Electron affinity—
Oxidation states
+2+3+4+5
Bold states = most common.