Einsteinium

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Einsteinium Quick Reference

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Notes

Symbol

Es

Atomic Number

99

Oxidation States

4

unverified

3

more common

2

less common with disagreement

Pauling Electronegativity

1.3

Electron Configuration

Orbital Occupancy

[Rn] 5f11 7s2

[Rn] represents the closed-shell electron configuration of radon

Orbital Filling Order

[Rn] 7s2 5f11

[Rn] represents the closed-shell electron configuration of radon

Term Symbol

4I15/2

see expanded configuration ...

Ionization Energies

I  (1)

 6.42 eV

II (2)

12.0 eV 

Molar Volume

solid, 298 K, 1 atm

28.52 cm3/mol

Melting Point

1133 ± 50 K

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Pyykkö Covalent Radius

single bond

165 pm

double bond

140 pm

Quantity

Einsteinium Atomic Structure

Notes

Ionization Energies

I  (1)

 6.42 eV

II (2)

12.0 eV 

Electron Binding Energies

K    (1s)

138396 ± 10 eV

LI   (2s)

 26782 ± 7 eV 

LII  (2p1/2)

 25865 ± 6 eV 

LIII (2p3/2)

 20384 ± 6 eV 

see all 24 energies ...

Electron Configuration

Orbital Occupancy

[Rn] 5f11 7s2

[Rn] represents the closed-shell electron configuration of radon

Orbital Filling Order

[Rn] 7s2 5f11

[Rn] represents the closed-shell electron configuration of radon

Term Symbol

4I15/2

see expanded configuration ...

Fluorescence Yields

ωK

0.972

ωL1

0.253

ωL2

0.497

ωL3

0.570

Coster-Kronig Yields

F12

0.03 

F13

0.54 

F23

0.196

Quantity

Einsteinium Physical Properties

Notes

Molar Volume

solid, 298 K, 1 atm

28.52 cm3/mol

Physical Form

metal

Quantity

Einsteinium Atomic Interaction

Notes

Oxidation States

4

unverified

3

more common

2

less common with disagreement

Pauling Electronegativity

1.3

Allred-Rochow Electronegativity

1.2

Nagle Electronegativity

1.14

Quantity

Einsteinium Thermodynamics

Notes

Melting Point

1133 ± 50 K

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Quantity

Einsteinium Identification

Notes

CAS Number

7429-92-7

Quantity

Einsteinium Atomic Size

Notes

Orbital Radius

157.6 pm

Pyykkö Covalent Radius

single bond

165 pm

double bond

140 pm

Quantity

Einsteinium Crystal Structure

Notes

Allotropes

allotrope

α-einsteinium

symbol

αEs

allotrope

β-einsteinium

symbol

βEs

Quantity

Einsteinium History

Notes

Discovery

date of discovery

1952

discoverer

Albert Ghiorso

birth

July 15, 1915

discoverer

Stanley G. Thompson

death

July 16, 1976

discoverer

Gary H. Higgins

discoverer

Glenn Theodore Seaborg

birth

April 19, 1912

death

February 25, 1999

discoverer

Martin H. Studier

discoverer

Paul R. Fields

discoverer

Sherman M. Fried

discoverer

Herbert Diamond

discoverer

Joseph F. Mech

discoverer

Gray L. Pyle

discoverer

John R. Huizenga

discoverer

A. Hirsch

discoverer

Winston M. Manning

discoverer

Charles I. Browne

discoverer

H. Louise Smith

discoverer

Rod W. Spence

location of discovery

Berkeley, California

Origin of Element Name

origin

Albert Einstein

origin description

person—German-born American physicist who won the 1921 Nobel Prize in Physics

Origin of Element Symbol

symbol: Es

origin

einsteinium

origin description

element name

Formerly Used or Proposed Element Names and Symbols

symbol

E

name

phoenicium

no matching symbol specified

name

athenium

matching symbol

Am

Quantity

Einsteinium Nomenclature

Notes

Element Names in Other Languages

French

einsteinium

German

Einsteinium

Italian

einsteinio

Spanish

einstenio

Portuguese

einstenio

Anions or Anionic Substituent Groups

einsteinide

Cations or Cationic Substituent Groups

einsteinium

Ligands

einsteinido

Heteroatomic Anion

einsteinate

'a' Term—Substitutive Nomenclature

einsteina

'y' Term—Chains and Rings Nomenclature

einsteiny

References    (Click the button next to a value above to see complete citation information for that entry)

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