Francium

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Francium Quick Reference

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Notes

Symbol

Fr

Atomic Number

87

Oxidation States

1

Pauling Electronegativity

0.7

Electron Configuration

Orbital Occupancy

[Rn] 7s1

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

Orbital Filling Order

[Rn] 7s1

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

Term Symbol

2S1/2

see expanded configuration ...

Ionization Energies

I (1)

4.072741 eV

Electron Affinity

0.486 ± 0.002 eV

Melting Point

300.15 K

Boiling Point

1 atm

946.15 K

Thermal Conductivity

solid, 300 K

14.5 W/(m K)

estimated

Pyykkö Covalent Radius

single bond

223 pm

double bond

218 pm

Quantity

Francium Atomic Structure

Notes

Ionization Energies

I (1)

4.072741 eV

Electron Affinity

0.486 ± 0.002 eV

Electron Binding Energies

K    (1s)

101137 eV

LI   (2s)

 18639 eV

LII  (2p1/2)

 17907 eV

LIII (2p3/2)

 15031 eV

see all 24 energies ...

Electron Configuration

Orbital Occupancy

[Rn] 7s1

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

Orbital Filling Order

[Rn] 7s1

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

Term Symbol

2S1/2

see expanded configuration ...

Fluorescence Yields

ωK

0.967

ωL1

0.146

ωL2

0.464

ωL3

0.394

Coster-Kronig Yields

F12

0.050

F13

0.62 

F23

0.109

Quantity

Francium Physical Properties

Notes

Physical Form

short-lived alkali metal

Isothermal Bulk Modulus

300 K

2.0 GPa

estimated

Isothermal Compressibility

300 K

0.50 GPa-1

estimated

Quantity

Francium Atomic Interaction

Notes

Oxidation States

1

Pauling Electronegativity

0.7

Mulliken-Jaffe Electronegativity

orbitals

0.68

Allred-Rochow Electronegativity

0.86

Nagle Electronegativity

0.82

Quantity

Francium Thermodynamics

Notes

Melting Point

300.15 K

Boiling Point

1 atm

946.15 K

Thermal Conductivity

solid, 300 K

14.5 W/(m K)

estimated

Critical Point

2030 K

Vapor Pressure

673 °C

100 kPa

465 °C

10 kPa

335 °C

1 kPa

246 °C

100 Pa

181 °C

10 Pa

131 °C

1 Pa

Debye Temperature

Low Temperature Limit ( 0 K )

39 K

Quantity

Francium Identification

Notes

CAS Number

7440-73-5

Quantity

Francium Atomic Size

Notes

Orbital Radius

244.7 pm

Pyykkö Covalent Radius

single bond

223 pm

double bond

218 pm

Cordero Covalent Radius

260 pm

Shannon-Prewitt Crystal Radius

ion charge: +1, coordination number: 6

194 pm

Shannon-Prewitt Effective Ionic Radius

ion charge: +1, coordination number: 6

180 pm

Pauling Empirical Crystal Radius

ion charge: +1

176 pm

Quantity

Francium History

Notes

Discovery

date of discovery

1939

discoverer

Maguerite Catherine Perey

birth

1909

death

1975

location of discovery

Curie Institute, Paris, France

Origin of Element Name

origin

France

origin description

place

Origin of Element Symbol

symbol: Fr

origin

francium

origin description

element name

Formerly Used or Proposed Element Names and Symbols

symbol

Fa

name

actinium K

matching symbol

AcK

name

moldavium

no matching symbol specified

name

virginium

matching symbol

Vi

name

russium

no matching symbol specified

name

ekacäsium

no matching symbol specified

Quantity

Francium Nomenclature

Notes

Element Names in Other Languages

French

francium

German

Francium

Italian

francio

Spanish

francio

Portuguese

frâncio

Anions or Anionic Substituent Groups

francide

Cations or Cationic Substituent Groups

francium

Ligands

francido

Heteroatomic Anion

francate

'a' Term—Substitutive Nomenclature

franca

'y' Term—Chains and Rings Nomenclature

francy

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

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