Astatine

Quantity		Astatine Quick Reference Click to see citations		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
hybrid: 14.3% s	2.85
orbital: p	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

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