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Uranium (U)

Uranium (U) is element 92 of the periodic table, an actinide in period 7, in the f-block. Its standard atomic weight is 238.02891, so one mole of uranium atoms has a mass of 238.02891 g. At room temperature it is a solid; it melts at 1134.85 °C and boils at 4130.85 °C.

92 U Uranium 238.02891

Period 7, f-block · Actinide

← Pa Protactinium Np Neptunium →

Atomic number	92
Symbol	U
Standard atomic weight	238.02891
Molar mass	238.02891 g/mol
Category	Actinide
Group	f-block (actinide series)
Period	7
Block	f-block
Electron configuration	[Rn] 7s² 5f³ 6d¹
Oxidation states	+6, +5, +4, +3
Electronegativity (Pauling)	1.38
Atomic radius (van der Waals)	240 pm
First ionisation energy	6.194 eV (597.6 kJ/mol)
Electron affinity	—
State at room temperature	Solid
Melting point	1408 K (1134.85 °C)
Boiling point	4404 K (4130.85 °C)
Density	18.95 g/cm³
Discovered	1789

Actinides

Ac · Actinium Th · Thorium Pa · Protactinium Np · Neptunium Pu · Plutonium Am · Americium Cm · Curium Bk · Berkelium Cf · Californium Es · Einsteinium Fm · Fermium Md · Mendelevium No · Nobelium

Calculate with Uranium

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Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.