Argon (Ar)

grundstof med atomnummer 18

Atomnummer	18
Atommasse	39.948
mass number	40

Gruppe	18
Periode	3
Blok	p

proton	18 p⁺
neutron	22 n⁰
elektron	18 e^-

Fysisk Egenskab

Atomradius	71 pm 197 pm
molar volume	24,2 cm³/mol
Kovalent Radius	96 pm 107 pm 96 pm 106 pm
Metallic Radius
Ionisk radius
Crystal Radius
Van der Waals-radius	188 pm 188 pm 199 pm 386,8 pm
massefylde	0,001633 g/cm³

Kemisk Egenskab

energi

proton affinity	369,2 kJ/mol
electron affinity	-11,5 eV/particle
ioniseringsenergi	15,7596112 eV/particle 27,62967 eV/particle 40,735 eV/particle 59,58 eV/particle 74,84 eV/particle 91,29 eV/particle 124,412 eV/particle 143,4567 eV/particle 422,598 eV/particle 479,76 eV/particle 540,43 eV/particle 618,95 eV/particle 685,47 eV/particle 755,13 eV/particle 855,47 eV/particle 918,374 eV/particle 4.120,6655 eV/particle 4.426,2227 eV/particle

Fordampningsvarme	6,52 kJ/mol
smeltevarme
standard enthalpy of formation
elektron

Elektronskal	2, 8, 8

Valenselektron	8 ⓘ

electron configuration	[Ne] 3s² 3p⁶ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶

Oxidationstrin	0
Elektronegativitet	19,17 eV/particle 0.2922
Electrophilicity Index	0,0832013314590371 eV/particle
fundamental state of matter

stoffase	Gas
gaseous state of matter	Monoatomic
Kogepunkt	87,302 K
Smeltepunkt	83,81 K
critical pressure	4,863 MPa
critical temperature	150,687 K
trippelpunkt	83,8058 K 68,89 kPa
appearance
farve	Colorless #ff1493 #80d1e3 #80d1e3
appearance	colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field
Brydningsindeks	1,000281
materialeegenskab
Varmeledningsevne	0,0177 W/(m K)
Termisk ekspansion
molar heat capacity	20,786 J/(mol K)
Varmefylde	0,52 J/(g⋅K)
Adiabateksponenten	5/3
electrical properties
type
specifik ledningsevne
Elektrisk resistivitet
superledning
Magnetisme
type	diamagnetic
magnetic susceptibility (Mass)	-0,000000006 m³/Kg
magnetic susceptibility (Molar)	-0,00000000024 m³/mol
magnetic susceptibility (Volume)	-0,0000000107
magnetic ordering
Curietemperaturen
Néel temperature
struktur
Krystalstruktur	Fladecentreret Kubisk (FCC)
lattice constant	5,26 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hårdhed
Kompressibilitetsmodul
Forskydningsmodul
E-modul
Poissons forhold
speed of sound	319 m/s
klassificering
Kategori	Ædelgasser, Noble gases
CAS Group	VIII
IUPAC Group	VIIIA
Glawe Number	3
Mendeleev Number	114
Pettifor Number	3
Geochemical Class	volatile
Goldschmidt classification	atmophile

øvrige

Gas Basicity	346,3 kJ/mol
polarizability	11,083 ± 0,007 a₀
C6 Dispersion Coefficient	64,2 a₀ 67,4 a₀
allotrope
Neutron cross section	0,66
Neutron Mass Absorption	0,00059
quantum number	1S0
rumgruppe	225 (Fm_3m)

Isotopes of Argon

Stable Isotopes	2
Unstable Isotopes	24
Natural Isotopes	3

²⁹Ar

mass number	29
neutron number	11
Relative Atomic Mass	29,040761 ± 0,000471 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	5/2
nuclear quadrupole moment
opdagelsesdato	2018
Paritet	+

decay mode	Intensitet
2p (2-proton emission)	100%

³⁰Ar

mass number	30
neutron number	12
Relative Atomic Mass	30,023694 ± 0,000192 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2015
Paritet	+

decay mode	Intensitet
2p (2-proton emission)	100%

³¹Ar

mass number	31
neutron number	13
Relative Atomic Mass	31,012158 ± 0,000215 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	15 ± 0,3 ms
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1986
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	68.3%
2p (2-proton emission)	9%
B+pA	0.38%
3p	0.07%
β⁺α (β⁺-delayed α emission)	0.03%
2p (2-proton emission)	0.0006%

³²Ar

mass number	32
neutron number	14
Relative Atomic Mass	31,997637824 ± 0,0000019 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	98 ± 2 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1977
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	35.58%

³³Ar

mass number	33
neutron number	15
Relative Atomic Mass	32,989925545 ± 0,00000043 Da
g-factor	-1,446 ± 0,012
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	173 ± 2 ms
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1964
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	38.7%

³⁴Ar

mass number	34
neutron number	16
Relative Atomic Mass	33,980270092 ± 0,000000083 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	846,46 ± 0,35 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1966
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

³⁵Ar

mass number	35
neutron number	17
Relative Atomic Mass	34,975257719 ± 0,00000073 Da
g-factor	0,42133333333333 ± 0,00013333333333333
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,7756 ± 0,001 s
spin	3/2
nuclear quadrupole moment	-0,084 ± 0,015
opdagelsesdato	1940
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

³⁶Ar

mass number	36
neutron number	18
Relative Atomic Mass	35,967545106 ± 0,000000028 Da
g-factor	0
natural abundance	0,3336 ± 0,021
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1920
Paritet	+

decay mode	Intensitet
2β⁺ (double β⁺ decay)

³⁷Ar

mass number	37
neutron number	19
Relative Atomic Mass	36,966776301 ± 0,000000221 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	35,011 ± 0,019 d
spin	3/2
nuclear quadrupole moment	0,076 ± 0,003
opdagelsesdato	1941
Paritet	+

decay mode	Intensitet
ϵ (electron capture)	100%

³⁸Ar

mass number	38
neutron number	20
Relative Atomic Mass	37,962732102 ± 0,000000209 Da
g-factor	0
natural abundance	0,0629 ± 0,007
radioaktivitet	stable isotope
halveringstid	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1934
Paritet	+

³⁹Ar

mass number	39
neutron number	21
Relative Atomic Mass	38,964313037 ± 0,000005367 Da
g-factor	-0,45428571428571 ± 0,0042857142857143
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	268 ± 8 y
spin	7/2
nuclear quadrupole moment	-0,116 ± 0,002
opdagelsesdato	1950
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

⁴⁰Ar

mass number	40
neutron number	22
Relative Atomic Mass	39,96238312204 ± 0,00000000234 Da
g-factor	0
natural abundance	99,6035 ± 0,025
radioaktivitet	stable isotope
halveringstid	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1920
Paritet	+

⁴¹Ar

mass number	41
neutron number	23
Relative Atomic Mass	40,96450057 ± 0,000000372 Da
g-factor	-0,37428571428571 ± 0,0022857142857143
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	109,61 ± 0,04 m
spin	7/2
nuclear quadrupole moment	-0,042 ± 0,004
opdagelsesdato	1936
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

⁴²Ar

mass number	42
neutron number	24
Relative Atomic Mass	41,963045737 ± 0,0000062 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	32,9 ± 1,1 y
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1952
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

⁴³Ar

mass number	43
neutron number	25
Relative Atomic Mass	42,965636056 ± 0,0000057 Da
g-factor	-0,4088 ± 0,0024
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	5,37 ± 0,06 m
spin	5/2
nuclear quadrupole moment	0,142 ± 0,014
opdagelsesdato	1969
Paritet

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

⁴⁴Ar

mass number	44
neutron number	26
Relative Atomic Mass	43,964923814 ± 0,0000017 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	11,87 ± 0,05 m
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1969
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

⁴⁵Ar

mass number	45
neutron number	27
Relative Atomic Mass	44,968039731 ± 0,00000055 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	21,48 ± 0,15 s
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1974
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

⁴⁶Ar

mass number	46
neutron number	28
Relative Atomic Mass	45,968039244 ± 0,0000025 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	8,4 ± 0,6 s
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1974
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

⁴⁷Ar

mass number	47
neutron number	29
Relative Atomic Mass	46,972767112 ± 0,0000013 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,23 ± 0,03 s
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1985
Paritet

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.2%

⁴⁸Ar

mass number	48
neutron number	30
Relative Atomic Mass	47,976001 ± 0,000018 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	415 ± 15 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2004
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	38%

⁴⁹Ar

mass number	49
neutron number	31
Relative Atomic Mass	48,981685 ± 0,000429 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	236 ± 8 ms
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1989
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	29%
2n (2-neutron emission)

⁵⁰Ar

mass number	50
neutron number	32
Relative Atomic Mass	49,985797 ± 0,000537 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	106 ± 6 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1989
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	37%
2n (2-neutron emission)

⁵¹Ar

mass number	51
neutron number	33
Relative Atomic Mass	50,993033 ± 0,000429 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1989
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵²Ar

mass number	52
neutron number	34
Relative Atomic Mass	51,998519 ± 0,000644 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2009
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵³Ar

mass number	53
neutron number	35
Relative Atomic Mass	53,00729 ± 0,00075 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	5/2
nuclear quadrupole moment
opdagelsesdato	2009
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁵⁴Ar

mass number	54
neutron number	36
Relative Atomic Mass	54,013484 ± 0,000859 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2018
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

historie

opdager eller opfinder	Sir William Ramsey, Baron Rayleigh
fundsted	Scotland
opdagelsesdato	1894
etymologi	Greek: argos (inactive).
udtale	AR-gon (engelsk)

source

Forekomst
Abundance in Earth's crust	3,5 mg/kg
natural abundance (verdenshave)	0,45 mg/L
natural abundance (menneskelige krop)
natural abundance (Meteoroid)
natural abundance (Solen)	0,007 %
Abundance in Universe	0,02 %

Nuclear Screening Constants

1	s	0.4925
2	p	3.9918
2	s	5.7696
3	p	11.2359
3	s	10.2432

Argon on ChemicalAid

Art & Architecture Thesaurus ID	300133261
Australian Educational Vocabulary ID	scot/1608
BNCF	30962
BNF	119700051
Brockhaus Enzyklopädie online ID	argon
CAB ID	42654
CAS-nummer	7440-37-1
ChEBI-ID	49475
ChemSpider ID	22407
CosIng number	54501
DSSTOX compound identifier	DTXCID0031055
DSSTox substance ID	DTXSID3052482
Den Store Danske-ID	argon
E-nummer	E938
ECHA Substance Infocard ID	100.028.315
Encyclopædia Universalis-ID	argon
Freebase-ID	/m/027r9df
French Vikidia ID	Argon
GND-identifikator	4142990-4
Gujarati Vishwakosh entry	આગૉર્ન
HSDB-ID	7902
ICSC ID	0154
InChI	InChI=1S/Ar
InChIKey	XKRFYHLGVUSROY-UHFFFAOYSA-N
KBpedia ID	Argon
LCAuth	sh85007108
LNB id	000328279
Latvian National Encyclopedia Online ID	133180
MeSH ID	D001128
NDL-nummer	00575518
National Library of Israel J9U ID	987007295519905171
OmegaWiki-betydningsdefinition	15591
OpenAlex ID	C547737533
OpenAlex ID	C2992172976
Open Food Facts ingredient ID	propellent-gas-e938
PDB-identifikator	1C6F
PDB-identifikator	1C6I
PDB-identifikator	1C66
PDB-identifikator	1C6C
PDB ligand ID	AR
PSH-ID	5818
PubChem CID	23968
Quora emne-ID	Argon-element
RxNorm ID	1368133
Römpp online ID	RD-01-03226
Spanish Vikidia ID	Argón
Store katalanske encyklopædi-ID	0004615
Store norske leksikon-ID	argon
Store russiske encyklopædi Online-ID	1827507
Treccani Vocabulary ID	argon
U.S. National Archives Identifier	10639898
UK Archival Thesaurus ID	f2/mt225/4347/12165
UNII	67XQY1V3KH
USGS Thesaurus ID	1395
WordNet 3.1 Synset ID	14653098-n
YSO ID	14683
ZVG-nummer	7180

Argon (Ar)

Fysisk Egenskab

Kemisk Egenskab

øvrige

Isotopes of Argon

29Ar

30Ar

31Ar

32Ar

33Ar

34Ar

35Ar

36Ar

37Ar

38Ar

39Ar

40Ar

41Ar

42Ar

43Ar

44Ar

45Ar

46Ar

47Ar

48Ar

49Ar

50Ar

51Ar

52Ar

53Ar

54Ar

historie

source

Nuclear Screening Constants

²⁹Ar

³⁰Ar

³¹Ar

³²Ar

³³Ar

³⁴Ar

³⁵Ar

³⁶Ar

³⁷Ar

³⁸Ar

³⁹Ar

⁴⁰Ar

⁴¹Ar

⁴²Ar

⁴³Ar

⁴⁴Ar

⁴⁵Ar

⁴⁶Ar

⁴⁷Ar

⁴⁸Ar

⁴⁹Ar

⁵⁰Ar

⁵¹Ar

⁵²Ar

⁵³Ar

⁵⁴Ar