59 - Praseodymium lanthanide
Discovered by Carl Auer von Welsbach in 1885
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.
Periodic table
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 21 | 2 in 4s + 6 in 4p + 10 in 4d + 3 in 4f |
| 5 | 8 | 2 in 5s + 6 in 5p |
| 6 | 2 | 2 in 6s |
Electron shells
grayish white Appearance
141 u Atomic Mass
1.85 Å Atomic Radius
3.79k K Boiling Point
5 Group
3 Common Oxidation States
2.03 Å Covalent Radius
6.77 g/cm³ Density
93 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f3 Electron Configuration
[Xe] 4f3 6s2 Electron Configuration (semantic)
1.13 Electronegativity
59 Electrons
5.47 eV First Ionization Energy
3, 4 ICSD Oxidation States
527, 1020, 2086, 3761, 5551 kJ/mol Ionization Energies
1.2k K Melting Point
31 Mendeleev Number
27.2 J/(mol·K) Molar Heat
6 Number of Shells
82 Neutrons
59 Atomic Number
15 Number of Isotopes
2, 3, 4 Oxidation States
6 Period
Solid Phase
59 Protons
2, 8, 18, 21, 8, 2 Electron Shell Occupations