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Curium

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Curium Quick Reference

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Notes

Symbol

Cm

Atomic Number

96

Oxidation States

6

unverified

5

unverified

4

less common

3

more common

2

less common

Pauling Electronegativity

1.3

Electron Configuration

Orbital Occupancy

[Rn] 5f7 6d1 7s2

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

Orbital Filling Order

[Rn] 7s2 5f7 6d1

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

Term Symbol

9D2

see expanded configuration ...

Ionization Energies

I (1)

5.9914 eV

Density

solid, 25 °C

13.510 g/cm3

Molar Volume

solid, 298 K, 1 atm

18.05 cm3/mol

Melting Point

1619 ± 50 K

Boiling Point

1 atm

3100 C

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Pyykkö Covalent Radius

single bond

166 pm

double bond

136 pm

Quantity

Curium Atomic Structure

Notes

Ionization Energies

I (1)

5.9914 eV

Electron Binding Energies

K    (1s)

128241 ± 3 eV

LI   (2s)

 24526 ± 5 eV

LII  (2p1/2)

 23651 ± 5 eV

LIII (2p3/2)

 18970 ± 5 eV

see all 24 energies ...

Electron Configuration

Orbital Occupancy

[Rn] 5f7 6d1 7s2

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

Orbital Filling Order

[Rn] 7s2 5f7 6d1

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

Term Symbol

9D2

see expanded configuration ...

Fluorescence Yields

ωK

0.972

ωL1

0.23 

ωL2

0.501

ωL3

0.482

Coster-Kronig Yields

F12

0.03 

F13

0.68 

F23

0.214

Quantity

Curium Physical Properties

Notes

Density

solid, 25 °C

13.510 g/cm3

Molar Volume

solid, 298 K, 1 atm

18.05 cm3/mol

Physical Form

silvery metal

Quantity

Curium Atomic Interaction

Notes

Oxidation States

6

unverified

5

unverified

4

less common

3

more common

2

less common

Pauling Electronegativity

1.3

Allred-Rochow Electronegativity

1.2

Nagle Electronegativity

1.11

Cohesive Energy

per mole

385 kJ/mol    

per atom

  3.99 eV/atom

Quantity

Curium Thermodynamics

Notes

Melting Point

1619 ± 50 K

Boiling Point

1 atm

3100 C

Thermal Conductivity

solid, 300 K

10 W/(m K)

estimated

Debye Temperature

Low Temperature Limit ( 0 K )

123 K

Quantity

Curium Identification

Notes

CAS Number

7440-51-9

Quantity

Curium Atomic Size

Notes

Orbital Radius

165.7 pm

Pyykkö Covalent Radius

single bond

166 pm

double bond

136 pm

Cordero Covalent Radius

169 pm

Shannon-Prewitt Crystal Radius

ion charge: +3, coordination number: 6

111 pm

ion charge: +4

coordination number: 6

 99 pm

coordination number: 8

109 pm

Shannon-Prewitt Effective Ionic Radius

ion charge: +3, coordination number: 6

97 pm

ion charge: +4

coordination number: 6

85 pm

coordination number: 8

95 pm

Quantity

Curium Crystal Structure

Notes

Allotropes

allotrope

α-curium

symbol

αCm

allotrope

β-curium

symbol

βCm

Quantity

Curium History

Notes

Discovery

date of discovery

1944

discoverer

Glenn Theodore Seaborg

birth

April 19, 1912

death

February 25, 1999

discoverer

Ralph A. James

discoverer

Albert Ghiorso

birth

July 15, 1915

location of discovery

Metallurgical Laboratory, Chicago, Illinois

Origin of Element Name

origin

Pierre and Marie Curie

origin description

people—Pierre was a French physicist and Marie was a Polish-born French chemist and physicist. They both shared the 1903 Nobel Prize in Physics with Antoine Henri Becquerel. (Marie Curie also received the 1911 Nobel Prize in Chemistry.)

Origin of Element Symbol

symbol: Cm

origin

curium

origin description

element name

Quantity

Curium Nomenclature

Notes

Element Names in Other Languages

French

curium

German

Curium

Italian

curio

Spanish

curio

Portuguese

curio

Anions or Anionic Substituent Groups

curide

Cations or Cationic Substituent Groups

curium

Ligands

curido

Heteroatomic Anion

curate

'a' Term—Substitutive Nomenclature

cura

'y' Term—Chains and Rings Nomenclature

cury

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

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