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Protactinium

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

Content
General data
Atomar properties
Electron configutation
Ionization energies
Isotopic data
Chemistry
Electrode potential
Physical properties
External data
Protactinium

 

General Information about Protactinium

Regular nameProtactiniumChemical symbolPaOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

 

Atomar Properties of Protactinium

Atomic number Z91 = number of protonsStandard Atomic Weight231.03588 (1)

 

Electron configuration of Protactinium

1s2s2p3s3p3d4s4p4d4f5s5p5d5f6s6p6d6f7s7p
2262610261014261022612

Abbreviated form: [Rn] 5f2 6d1 7s2 .

 

Ionization Energies of Protactinium

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

IE1
5.89

 

Isotopic Data of Protactinium

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

 

Chemistry of Protactinium

 

Oxidation states+ 5Electronegativity1.5 (Pauling original)
1.50 (Pauling)Electron affinity0.55 eV
53.03 kJ mol-1

 

Standard Electrode Potential

E0 (V)SymbolNoxName Ox.
Name Red.		Ox.
Red.		e-
-1.9Pa+ IV
+ III		Protactinium(IV) cation
Protactinium(III) cation		Pa4+
⇄ Pa3+		+ e-
-1.49Pa+ IV
0		Protactinium(IV) cation
Protactinium		Pa4+
⇄ Pa (s)		+ 4 e-
-1.34Pa+ III
0		Protactinium(III) cation
Protactinium		Pa3+
⇄ Pa (s)		+ 3 e-

 

Material and Physical Properties

Melting point1572 °CEnthalpy of fusion (molar)12.34 kJ mol-1Boiling point4027 °CEnthalpy of vaporization481 kJ mol-1Density15.37 g cm-3

 

External Data, Identifiers

CAS registry number7440-13-3InChI =1S/PaInChIKeyXLROVYAPLOFLNU-UHFFFAOYSA-NPubChem ID23945

 

More Chemistry

isotopes

 

 

 

 

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Last update: 2022-12-12

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