Hafnium

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

Content

General data

Atomar properties

Electron configutation

General Information about Hafnium

Regular nameHafniumChemical symbolHfOther namesSystematic nameHistorical 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

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	2		2

Abbreviated form: [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 volts (eV) per atom to separate a given electron from an Hafnium atom.

IE1	IE2	IE3	IE4
6.82507	15	23.3	33.33

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)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-1.70	Hf	+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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