Mendelevium

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Mendelevium Quick Reference

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Notes

Symbol

Md

Atomic Number

101

Oxidation States

3

more common

2

less common with disagreement

1

unverified

Pauling Electronegativity

1.3

Electron Configuration

Orbital Occupancy

[Rn] 5f13 7s2

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

Orbital Filling Order

[Rn] 7s2 5f13

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

Term Symbol

2F7/2

see expanded configuration ...

Ionization Energies

I (1)

6.58 eV

Melting Point

1100.15 K

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Pyykkö Covalent Radius

single bond

173 pm

double bond

139 pm

Quantity

Mendelevium Atomic Structure

Notes

Ionization Energies

I (1)

6.58 eV

Electron Binding Energies

K    (1s)

145526 ± 20 eV

LI   (2s)

 28387 ± 8 eV 

LII  (2p1/2)

 27438 ± 10 eV

LIII (2p3/2)

 21356 ± 7 eV 

see all 24 energies ...

Electron Configuration

Orbital Occupancy

[Rn] 5f13 7s2

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

Orbital Filling Order

[Rn] 7s2 5f13

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

Term Symbol

2F7/2

see expanded configuration ...

Fluorescence Yields

ωK

0.973

ωL1

0.272

ωL2

0.515

ωL3

0.588

Coster-Kronig Yields

F12

0.02 

F13

0.53 

F23

0.191

Quantity

Mendelevium Physical Properties

Notes

Physical Form

solid metal

Quantity

Mendelevium Atomic Interaction

Notes

Oxidation States

3

more common

2

less common with disagreement

1

unverified

Pauling Electronegativity

1.3

Allred-Rochow Electronegativity

1.2

Nagle Electronegativity

1.17

Quantity

Mendelevium Thermodynamics

Notes

Melting Point

1100.15 K

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Quantity

Mendelevium Identification

Notes

CAS Number

7440-11-1

Quantity

Mendelevium Atomic Size

Notes

Orbital Radius

152.7 pm

Pyykkö Covalent Radius

single bond

173 pm

double bond

139 pm

Quantity

Mendelevium History

Notes

Discovery

date of discovery

1955

discoverer

Albert Ghiorso

birth

July 15, 1915

discoverer

Bernard G. Harvey

discoverer

Gregory R. Choppin

discoverer

Stanley G. Thompson

death

July 16, 1976

discoverer

Glenn Theodore Seaborg

birth

April 19, 1912

death

February 25, 1999

location of discovery

Berkeley, California

Origin of Element Name

origin

Dmitrii I. Mendeleev

origin description

person—Russian chemist who first devised and published the periodic table

Origin of Element Symbol

symbol: Md

origin

mendelevium

origin description

element name

Formerly Used or Proposed Element Names and Symbols

symbol

Mv

name

unnilunium

matching symbol

Unu

Quantity

Mendelevium Nomenclature

Notes

Element Names in Other Languages

French

mendelévium

German

Mendelevium

Italian

mendelevio

Spanish

mendelevio

Portuguese

mendelévio

Anions or Anionic Substituent Groups

mendelevide

Cations or Cationic Substituent Groups

mendelevium

Ligands

mendelevido

Heteroatomic Anion

mendelevate

'a' Term—Substitutive Nomenclature

mendeleva

'y' Term—Chains and Rings Nomenclature

mendelevy

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

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Ghiorso, A., B. G. Harvey, G. R. Choppin, S. G. Thompson, and G. T. Seaborg. "New Element Mendelevium, Atomic Number 101." Physical Review, volume 98, number 5, 1955, pp. 1518–1519. doi:10.1103/PhysRev.98.1518

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