61
Pm
Promethium
(145)
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#61
Promethium
lanthanide· Solid·145 u
Promethium, originally prometheum, is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements.
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Identity
- Symbol
- Pm
- Atomic Number
- 61
- Atomic Mass
- 145 u
- Category
- lanthanide
- Block
- f-block
- Period
- 6
- Group
- 3
- Appearance
- metallic
- Year Discovered
- 1945 CE
- Discovered By
- Chien Shiung Wu
- Named By
- Isotopes of promethium
Electrons
- Configuration
- [Xe] 4f5 6s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f5
- Shells
- 2, 8, 18, 23, 8, 2
- Electronegativity
- 1.13
- Electron Affinity
- 12.45
- Oxidation States
- +3
- Ionization Energies
- 540, 1050, 2150, 3970
Physical Properties
- State at
- Solid
- Melting Point
- 1315
- Boiling Point
- 3273
- Density
- 7.26
- Crystal Structure
- HEX
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 199 pm
- Metallic Radius
- 181 pm
- Bulk Modulus
- 33 GPa GPa
- Shear Modulus
- 18 GPa GPa
- Young's Modulus
- 46 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 17.9 W/(m K) W/(m·K)
- Specific Heat
- 185 J/(kg K) J/(g·K)
- Heat of Vaporization
- 289 kJ/mol kJ/mol
- Heat of Fusion
- 7.13 kJ/mol kJ/mol
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 0
- Ocean
- 0
- Human Body
- 0