92
U
Uranium
238.028913
2818322192
#92
Uranium
actinide· Solid·238.028913 u
Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.
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Identity
- Symbol
- U
- Atomic Number
- 92
- Atomic Mass
- 238.028913 u
- Category
- actinide
- Block
- f-block
- Period
- 7
- Group
- 3
- Appearance
- Chemical element with atomic number 92 (U)
- Year Discovered
- 1789 CE
- Discovered By
- Martin Heinrich Klaproth
- Named By
- Uranus
Electrons
- Configuration
- [Rn] 5f3 6d1 7s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f3 6d1
- Shells
- 2, 8, 18, 32, 21, 9, 2
- Electronegativity
- 1.38
- Electron Affinity
- 50.94
- Oxidation States
- +6, +5, +4, +3
- Ionization Energies
- 597.6, 1420
Physical Properties
- State at
- Solid
- Melting Point
- 1405.3
- Boiling Point
- 4404
- Density
- 19.1
- Molar Heat
- 27.665 J/(mol·K)
- Crystal Structure
- Orthorhombic
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 196 pm
- Metallic Radius
- 156 pm
- Mohs Hardness
- 6
- Brinell Hardness
- 2400 MPa MPa
- Vickers Hardness
- 1960 MPa MPa
- Bulk Modulus
- 100 GPa GPa
- Shear Modulus
- 111 GPa GPa
- Young's Modulus
- 208 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 27.5 W/(m K) W/(m·K)
- Electrical Conductivity
- 3.6 MS/m S/m
- Specific Heat
- 116 J/(kg K) J/(g·K)
- Heat of Vaporization
- 422 kJ/mol kJ/mol
- Heat of Fusion
- 9.14 kJ/mol kJ/mol
Abundance
- Universe
- 20.0 ppt
- Sun
- 10 ppt
- Meteorite
- 9.50 ppb
- Earth's Crust
- 19.05 ppm
- Ocean
- 3.30 ppb
- Human Body
- 1.00 ppb