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Hafnium

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


Contents


Hafnium

 

General Information about Hafnium

Regular nameHafniumChemical symbolHfOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

 

Atomar Properties of Hafnium

Atomic number Z72 = number of protonsStandard Atomic Weight178.486 (6)

 

Electron configuration of Hafnium

1s2s2p3s3p3d4s4p4d4f5s5p5d5f6s6p6d6f7s7p
22626102610142622

Shorthand electron configuration of Hafnium: [Xe] 4f14 5d2 6s2 .

 

Ionization Energies of Hafnium

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 Hafnium atom.

IE1IE2IE3IE4
6.825071523.333.33

 

Isotopic Data of Hafnium

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

 

Chemistry of Hafnium

 

Oxidation states+4Electronegativity1.3 (Pauling original)
1.30 (Pauling)
1.16 (Allen)
3.8 eV (Pearson)
Electron affinity0.1780(7) eV
17.18(7) kJ mol-1

 

Standard Electrode Potential

E0 (V)SymbolNoxName Ox.
Name Red.
Ox.
Red.
e-
-1.70Hf+IV
0
Hafnium(IV) cation
Hafnium
Hf4+
⇄ Hf (s)
+ 4 e-

 

Material and Physical Properties

Melting point2233 °CEnthalpy of fusion (molar)27.2 kJ mol-1Boiling point4600 °CEnthalpy of vaporization661.1 kJ mol-1Density13.31 g cm-3

 

External Data, Identifiers

CAS registry number7440-58-6InChI =1S/HfInChIKeyVBJZVLUMGGDVMO-UHFFFAOYSA-NPubChem ID23986

 


More Chemistry

isotopes

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Last update: 2022-12-12


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