Astatine

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Astatine Quick Reference

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Notes

Symbol

At

Atomic Number

85

Oxidation States

 7

less common

 5

less common

 3

less common

 1

less common with disagreement

-1

more common with disagreement

Pauling Electronegativity

2.2

Electron Configuration

Orbital Occupancy

[Xe] 4f14 5d10 6s2 6p5

[Xe] represents the closed-shell electron configuration of xenon

Orbital Filling Order

[Xe] 6s2 4f14 5d10 6p5

[Xe] represents the closed-shell electron configuration of xenon

Term Symbol

2P3/2

see expanded configuration ...

Ionization Energies

I (1)

9.31751 ± 0.00008 eV

Electron Affinity

  2.8 ± 0.2 eV   

22600 ± 1600 cm-1

Melting Point

575.15 K

Boiling Point

1 atm

607.00 K

Thermal Conductivity

solid, 300 K

1.97 W/(m K)

estimated

Pyykkö Covalent Radius

single bond

147 pm

double bond

138 pm

triple bond

138 pm

Enthalpy of Fusion

1 atm

23.8 kJ/mol

Quantity

Astatine Atomic Structure

Notes

Ionization Energies

I (1)

9.31751 ± 0.00008 eV

Electron Affinity

  2.8 ± 0.2 eV   

22600 ± 1600 cm-1

Electron Binding Energies

K    (1s)

95730 eV

LI   (2s)

17493 eV

LII  (2p1/2)

16785 eV

LIII (2p3/2)

14214 eV

see all 21 energies ...

Electron Configuration

Orbital Occupancy

[Xe] 4f14 5d10 6s2 6p5

[Xe] represents the closed-shell electron configuration of xenon

Orbital Filling Order

[Xe] 6s2 4f14 5d10 6p5

[Xe] represents the closed-shell electron configuration of xenon

Term Symbol

2P3/2

see expanded configuration ...

Clementi-Raimondi Effective Nuclear Charge

1s

Orbital Exponent

83.3554

ζ

Principle Quantum Number

1

n

Effective Nuclear Charge

83.3554

Zeff = ζ × n

2s

Orbital Exponent

31.3338

ζ

Principle Quantum Number

2

n

Effective Nuclear Charge

62.6676

Zeff = ζ × n

see all 15 effective nuclear charges ...

Screening Percentage

81.9%

Fluorescence Yields

ωK

0.966

ωL1

0.138

ωL2

0.438

ωL3

0.374

Coster-Kronig Yields

F12

0.057

F13

0.62 

F23

0.113

Quantity

Astatine Physical Properties

Notes

Physical Form

crystals

Quantity

Astatine Atomic Interaction

Notes

Oxidation States

 7

less common

 5

less common

 3

less common

 1

less common with disagreement

-1

more common with disagreement

Pauling Electronegativity

2.2

Mulliken-Jaffe Electronegativity

hybrid14.3% s

2.85

orbitalp

2.55

Allred-Rochow Electronegativity

1.90

Configuration Energy

electron volt units

14.1 eV

Pauling units

 2.39  

Nagle Electronegativity

2.12

Quantity

Astatine Thermodynamics

Notes

Melting Point

575.15 K

Boiling Point

1 atm

607.00 K

Thermal Conductivity

solid, 300 K

1.97 W/(m K)

estimated

Critical Point

1060 K

Vapor Pressure

334 °C

100 kPa

258 °C

10 kPa

202 °C

1 kPa

156 °C

100 Pa

119 °C

10 Pa

88 °C

1 Pa

Enthalpy of Fusion

1 atm

23.8 kJ/mol

Quantity

Astatine Identification

Notes

CAS Number

7440-68-8

Quantity

Astatine Atomic Size

Notes

Orbital Radius

114.6 pm

Pyykkö Covalent Radius

single bond

147 pm

double bond

138 pm

triple bond

138 pm

Cordero Covalent Radius

150 pm

Shannon-Prewitt Crystal Radius

ion charge: +7, coordination number: 6

76 pm

Shannon-Prewitt Effective Ionic Radius

ion charge: +7, coordination number: 6

62 pm

Quantity

Astatine History

Notes

Discovery

date of discovery

1940

discoverer

Dale Raymond Corson

birth

1914

discoverer

Kenneth Ross Mackenzie

birth

1912

discoverer

Emilio Gino Segrè

birth

1905

death

1989

location of discovery

Berkeley, California

Origin of Element Name

origin

astatos

origin description

property—Greek for unstable

Origin of Element Symbol

symbol: At

origin

astatine

origin description

element name

Formerly Used or Proposed Element Names and Symbols

name

alabamine

matching symbol

Ab

Quantity

Astatine Nomenclature

Notes

Element Names in Other Languages

French

astate

German

Astat

Italian

astato

Spanish

astato

Portuguese

astato

Anions or Anionic Substituent Groups

At-, astatide(1-)

Cations or Cationic Substituent Groups

astatine

Ligands

astatido (general)

At-, astatido(1-)

Heteroatomic Anion

astatate

'a' Term—Substitutive Nomenclature

astata

'y' Term—Chains and Rings Nomenclature

astaty

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

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