Fermium

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

Contents

General Information about Fermium

Regular nameFermiumChemical symbolFmOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Fermium

Atomic number Z100 = number of protonsStandard Atomic Weight257.095106119

Electron configuration of Fermium

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	10	12	2	6			2

Shorthand electron configuration of Fermium: [Rn] 5f¹² 7s² .

Ionization Energies of Fermium

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 Fermium atom.

IE1
6.50

Isotopic Data of Fermium

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

Chemistry of Fermium

Oxidation states+ 3Electronegativity1.3 (Pauling original)
1.30 (Pauling)Electron affinity0.35 eV
33.96 kJ mol^-1

Standard Electrode Potential

E⁰ (V)	Symbol	N_ox	Name Ox. Name Red.	Ox. Red.	e^-
-2.37	Fm	+II 0	Fermium(II) cation Fermium	Fm²⁺ ⇄ Fm	+ 2 e^-
-1.96	Fm	+III 0	Fermium(III) cation Fermium	Fm³⁺ ⇄ Fm	+ 3 e^-

Material and Physical Properties

Melting point1527 °CDensity9.7(1) g cm^-3

External Data, Identifiers

CAS registry number7440-72-4InChI =1S/FmInChIKeyMIORUQGGZCBUGO-UHFFFAOYSA-NPubChem ID23998

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isotopes

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Last update: 2022-12-12

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