Periodic Table
92
U
238.03
Uranium
ActinoidNuclear fuel (²³⁵U); +6 as uranyl UO₂²⁺; yellowcake.
Electronic Configuration
[Rn] 5f³ 6d¹ 7s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f³ 6d¹ 7s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
21e⁻n=5
9e⁻n=6
2e⁻n=7
Properties
Atomic number
92
Atomic mass
238.03 u
Category
Actinoid
Block / Group / Period
f · — · 7
Valence electrons
2
Oxidation states
+3 to +6
Electronegativity
1.38
Atomic radius
175 pm
Ionization energy
598 kJ/mol
Electron affinity
51 kJ/mol
Melting point
1405 K / 1132 °C
Boiling point
4404 K / 4131 °C
Density
18.95 g/cm³
State at 25 °C
solid
Personal Notes
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