Uranium

Chemical, physical and material properties and data of the chemical element Uranium.

Contents

General Information about Uranium

Regular nameUraniumChemical symbolUOther namesElement 92Historical namesName meaning, originUranus (planet named after the Greek god of the sky, Uranos)Discovery (year)(1789) - Martin Heinrich Klaproth. First isolation: 1841 by Eugène-Melchior Péligot.OccurencePosition in the PSEPeriod 7, f-blockGroup membershipActinides

Atomar Properties of Uranium

Atomic number Z92 = number of protonsStandard Atomic Weight238.02891 (3)

Electron configuration of Uranium

1s	2s	2p	3s	3p	3d	4s	4p	4d	4f	5s	5p	5d	5f	6s	6p	6d	6f	7s	7p
2	2	6	2	6	10	2	6	10	14	2	6	10	3	2	6	1		2

Shorthand electron configuration of Uranium: [Rn] 5f³ 6d¹ 7s² .

Ionization Energies of Uranium

The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volt (eV) per atom to separate a given electron from an Uranium atom.

IE1	IE2
6.1941	10.6

Isotopic Data of Uranium

An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Uranium isotopes.

Chemistry of Uranium

Oxidation states+ 6Electronegativity1.7 (Pauling original)
1.38 (Pauling)Electron affinity0.53 eV
50.94 kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-1.66	U	+ III 0	Uranium(III) cation Uranium	U³⁺ ⇄ U (s)	+ 3 e^-
-0.52	U	+ IV + III	Uranium(IV) cation Uranium(III) cation	U⁴⁺ ⇄ U³⁺	+ e^-
0.327	U	+ VI + IV	Uranyl cation Uranium(IV) cation	UO₂²⁺ + 4 H⁺ ⇄ U⁴⁺ + H₂O	+ 2 e^-

Material and Physical Properties

Melting point1132.2 °CEnthalpy of fusion (molar)9.14 kJ mol^-1Boiling point4131 °CEnthalpy of vaporization422.6 kJ mol^-1Density19.16 g cm^-3

External Data, Identifiers

CAS registry number7440-61-1InChI =1S/UInChIKeyJFALSRSLKYAFGM-UHFFFAOYSA-NPubChem ID23989

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Last update: 2022-12-24

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