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Thulium

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


Contents


Thulium

 

General Information about Thulium

Regular nameThuliumChemical symbolTmOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

 

Atomar Properties of Thulium

Atomic number Z69 = number of protonsStandard Atomic Weight168.934218 (6)

 

Electron configuration of Thulium

1s2s2p3s3p3d4s4p4d4f5s5p5d5f6s6p6d6f7s7p
2262610261013262

Shorthand electron configuration of Thulium: [Xe] 4f13 6s2 .

 

Ionization Energies of Thulium

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 Thulium atom.

IE1IE2IE3IE4
6.1843112.0523.6842.7

 

Isotopic Data of Thulium

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

 

Chemistry of Thulium

 

Oxidation states+3Electronegativity1.1 (Pauling original)
1.25 (Pauling)
Electron affinity1.029(22) eV
99(3) kJ mol-1

 

Standard Electrode Potential

E0 (V)SymbolNoxName Ox.
Name Red.
Ox.
Red.
e-
-2.4Tm+ II
0
Thulium(II) cation
Thulium
Tm2+
⇄ Tm
+ 2 e-
-2.319Tm+ III
0
Thulium(III) cation
Thulium
Tm3+
⇄ Tm
+ 3 e-
-2.2Tm+ III
+ II
Thulium(III) cation
Thulium(II) cation
Tm3+
⇄ Tm2+
+ e-

 

Material and Physical Properties

Melting point1545 °CEnthalpy of fusion (molar)16.84 kJ mol-1Boiling point1950 °CEnthalpy of vaporization247 kJ mol-1Density9.318 g cm-3 (25 °C)

 

External Data, Identifiers

CAS registry number7440-30-4InChI =1S/TmInChIKeyFRNOGLGSGLTDKL-UHFFFAOYSA-NPubChem ID23961

 


More Chemistry

isotopes

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Last update: 2022-12-12


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