59
Pr
Praseodymium
140.907662
28182182
#59
Praseodymium
lanthanide· Solid·140.907662 u
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.
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Identity
- Symbol
- Pr
- Atomic Number
- 59
- Atomic Mass
- 140.907662 u
- Category
- lanthanide
- Block
- f-block
- Period
- 6
- Group
- 3
- Appearance
- grayish white
- Year Discovered
- 1885 CE
- Discovered By
- Carl Auer von Welsbach
- Named By
- twin
Electrons
- Configuration
- [Xe] 4f3 6s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f3
- Shells
- 2, 8, 18, 21, 8, 2
- Electronegativity
- 1.13
- Electron Affinity
- 93
- Oxidation States
- +3
- Ionization Energies
- 527, 1020, 2086, 3761, 5551
Physical Properties
- State at
- Solid
- Melting Point
- 1208
- Boiling Point
- 3403
- Density
- 6.77
- Molar Heat
- 27.2 J/(mol·K)
- Crystal Structure
- HEX
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 203 pm
- Metallic Radius
- 183 pm
- Mohs Hardness
- 2
- Brinell Hardness
- 481 MPa MPa
- Vickers Hardness
- 400 MPa MPa
- Bulk Modulus
- 28.8 GPa GPa
- Shear Modulus
- 15.4 GPa GPa
- Young's Modulus
- 37.3 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 12.5 W/(m K) W/(m·K)
- Electrical Conductivity
- 1.48 MS/m S/m
- Specific Heat
- 193 J/(kg K) J/(g·K)
- Heat of Vaporization
- 331 kJ/mol kJ/mol
- Heat of Fusion
- 6.89 kJ/mol kJ/mol
Abundance
- Universe
- 400 ppt
- Sun
- 1.00 ppb
- Meteorite
- 78.0 ppb
- Earth's Crust
- 6.773 ppm
- Ocean
- 6.4e-7 ppm
- Human Body
- 0