Praseodymium

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

Contents

General Information about Praseodymium

Regular namePraseodymiumChemical symbolPrOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Praseodymium

Atomic number Z59 = number of protonsStandard Atomic Weight140.90766 (1)

Electron configuration of Praseodymium

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	3	2	6			2

Shorthand electron configuration of Praseodymium: [Xe] 4f³ 6s² .

Ionization Energies of Praseodymium

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 Praseodymium atom.

IE1	IE2	IE3	IE4	IE5
5.473	10.55	21.624	38.98	57.53

Isotopic Data of Praseodymium

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

Chemistry of Praseodymium

Electronegativity1.1 (Pauling original)
1.13 (Pauling)Electron affinity0.962(24) eV
93(3) kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-3.1	Pr	+ III + II	Praseodymium(III) cation Praseodymium(II) cation	Pr³⁺ ⇄ Pr²⁺	+ e^-
-2.353	Pr	+ III 0	Praseodymium(III) cation Praseodymium	Pr³⁺ ⇄ Pr (s)	+ 3 e^-
-2.0	Pr	+ II 0	Praseodymium(II) cation Praseodymium	Pr²⁺ ⇄ Pr (s)	+ 2 e^-
3.2	Pr	+ IV + III	Praseodymium(IV) cation Praseodymium(III) cation	Pr⁴⁺ ⇄ Pr³⁺	+ e^-

Material and Physical Properties

Melting point931 °CEnthalpy of fusion (molar)6.89 kJ mol^-1Boiling point3520 °CEnthalpy of vaporization332.6 kJ mol^-1Density6.77 g cm^-3

External Data, Identifiers

CAS registry number7440-10-0InChI =1S/PrInChIKeyPUDIUYLPXJFUGB-UHFFFAOYSA-NPubChem ID23942

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Last update: 2022-12-12

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