Einsteinium

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

Contents

General Information about Einsteinium

Regular nameEinsteiniumChemical symbolEsOther namesHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership

Atomar Properties of Einsteinium

Atomic number Z99 = number of protonsStandard Atomic Weight252.082979905

Electron configuration of Einsteinium

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	11	2	6			2

Shorthand electron configuration of Einsteinium: [Rn] 5f¹¹ 7s² .

Ionization Energies of Einsteinium

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 Einsteinium atom.

IE1	IE2
6.42	12.0

Isotopic Data of Einsteinium

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

Chemistry of Einsteinium

Oxidation states+ 3Electronegativity1.3 (Pauling original)
1.30 (Pauling)Electron affinity-0.3 eV
-28.6 kJ mol^-1

Material and Physical Properties

Melting point860 °CBoiling point996 °CDensity8.84 g cm^-3

External Data, Identifiers

CAS registry number7429-92-7InChI =1S/EsInChIKeyCKBRQZNRCSJHFT-UHFFFAOYSA-NPubChem ID23913

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isotopes

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Last update: 2022-12-12

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