Argon (Ar)

chemical element with symbol Ar and atomic number 18; rare gas

Atomski broj	18
Relativna atomska masa	39.948
Maseni broj	40

Skupina	18
Perioda	3
Blok	p

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

Animated Bohrov model atoma of Ar (Argon)

Physical Property

Atomski Radijus	71 pm 197 pm
Molni volumen	24,2 cm³/mol
Kovalentni Radijus	96 pm 107 pm 96 pm 106 pm
Metallic Radius
Ionski radijus
Crystal Radius
Van der Waals radius	188 pm 188 pm 199 pm 386,8 pm
gustoća	0,001633 g/cm³

Kemijsko Svojstvo

energija

proton affinity	369,2 kJ/mol
Elektronski afinitet	−11,5 eV/particle
ionization energy	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

Toplina isparivanja	6,52 kJ/mol
toplina taljenja
standard enthalpy of formation
elektron

Elektronska ljuska	2, 8, 8

valence electron	8 ⓘ

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

Oksidacijski broj	0
Elektronegativnost	19,17 eV/particle 0.2922
Electrophilicity Index	0,0832013314590371 eV/particle
fundamental state of matter

agregatno stanje	Plinovito
gaseous state of matter	Monoatomic
Vrelište	87,302 K
Talište	83,81 K
critical pressure	4,863 MPa
critical temperature	150,687 K
Trojna točka	83,8058 K 68,89 kPa
appearance
boja	Bezbojan #ff1493 #80d1e3 #80d1e3
appearance	colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field
Indeks prelamanja	1,000281
thermodynamic material property
Toplinska vodljivost	0,0177 W/(m K)
Toplinsko istezanje
molar heat capacity	20,786 J/(mol K)
Specifični toplinski kapacitet	0,52 J/(g⋅K)
heat capacity ratio	5/3
electrical properties
type
electrical conductivity
Električna otpornost i provodnost
Supravodljivost
Magnetizam
type	diamagnetic
Magnetna susceptibilnost (Mass)	−0,000000006 m³/Kg
Magnetna susceptibilnost (Molar)	−0,00000000024 m³/mol
Magnetna susceptibilnost (Volume)	−0,0000000107
magnetic ordering
Curieva temperatura
Néel temperature
struktura
Kristalna struktura	Kubna plošno centrirana (FCC)
lattice constant	5,26 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
Tvrdoća
bulk modulus
shear modulus
Youngov modul elastičnosti
Poissonov omjer
brzina zvuka	319 m/s
classification
Kategorija	Plemeniti plinovi, Noble gases
CAS Group	VIII
IUPAC Group	VIIIA
Glawe Number	3
Mendeleev Number	114
Pettifor Number	3
Geochemical Class	volatile
Goldschmidt classification	atmophile

other

Gas Basicity	346,3 kJ/mol
polarizability	11,083 ± 0,007 a₀
C6 Dispersion Coefficient	64,2 a₀ 67,4 a₀
allotrope
Nuklearni udarni presjek	0,66
Neutron Mass Absorption	0,00059
Kvantni brojevi	1S0
space group	225 (Fm_3m)

Isotopes of Argon

Stabilni izotopi	2
Nestabilni izotopi	24
Natural Isotopes	3

²⁹Ar

Maseni broj	29
neutron number	11
Relativna Atomska Masa	29,040761 ± 0,000471 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	2018
Parnost	+

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

³⁰Ar

Maseni broj	30
neutron number	12
Relativna Atomska Masa	30,023694 ± 0,000192 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	2015
Parnost	+

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

³¹Ar

Maseni broj	31
neutron number	13
Relativna Atomska Masa	31,012158 ± 0,000215 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	15 ± 0,3 ms
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1986
Parnost	+

decay mode	intensity
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

Maseni broj	32
neutron number	14
Relativna Atomska Masa	31,997637824 ± 0,0000019 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	98 ± 2 ms
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1977
Parnost	+

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

³³Ar

Maseni broj	33
neutron number	15
Relativna Atomska Masa	32,989925545 ± 0,00000043 Da
g-factor	−1,446 ± 0,012
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	173 ± 2 ms
spin	1/2
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1964
Parnost	+

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

³⁴Ar

Maseni broj	34
neutron number	16
Relativna Atomska Masa	33,980270092 ± 0,000000083 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	846,46 ± 0,35 ms
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1966
Parnost	+

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

³⁵Ar

Maseni broj	35
neutron number	17
Relativna Atomska Masa	34,975257719 ± 0,00000073 Da
g-factor	0,42133333333333 ± 0,00013333333333333
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,7756 ± 0,001 s
spin	3/2
nuclear quadrupole moment	−0,084 ± 0,015
vrijeme otkrića ili izuma	1940
Parnost	+

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

³⁶Ar

Maseni broj	36
neutron number	18
Relativna Atomska Masa	35,967545106 ± 0,000000028 Da
g-factor	0
natural abundance	0,3336 ± 0,021
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1920
Parnost	+

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

³⁷Ar

Maseni broj	37
neutron number	19
Relativna Atomska Masa	36,966776301 ± 0,000000221 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	35,011 ± 0,019 d
spin	3/2
nuclear quadrupole moment	0,076 ± 0,003
vrijeme otkrića ili izuma	1941
Parnost	+

decay mode	intensity
ϵ (electron capture)	100%

³⁸Ar

Maseni broj	38
neutron number	20
Relativna Atomska Masa	37,962732102 ± 0,000000209 Da
g-factor	0
natural abundance	0,0629 ± 0,007
radioaktivnost	stable isotope
Vrijeme poluraspada	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1934
Parnost	+

³⁹Ar

Maseni broj	39
neutron number	21
Relativna Atomska Masa	38,964313037 ± 0,000005367 Da
g-factor	−0,45428571428571 ± 0,0042857142857143
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	268 ± 8 y
spin	7/2
nuclear quadrupole moment	−0,116 ± 0,002
vrijeme otkrića ili izuma	1950
Parnost	-

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

⁴⁰Ar

Maseni broj	40
neutron number	22
Relativna Atomska Masa	39,96238312204 ± 0,00000000234 Da
g-factor	0
natural abundance	99,6035 ± 0,025
radioaktivnost	stable isotope
Vrijeme poluraspada	Not Radioactive ☢️
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1920
Parnost	+

⁴¹Ar

Maseni broj	41
neutron number	23
Relativna Atomska Masa	40,96450057 ± 0,000000372 Da
g-factor	−0,37428571428571 ± 0,0022857142857143
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	109,61 ± 0,04 m
spin	7/2
nuclear quadrupole moment	−0,042 ± 0,004
vrijeme otkrića ili izuma	1936
Parnost	-

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

⁴²Ar

Maseni broj	42
neutron number	24
Relativna Atomska Masa	41,963045737 ± 0,0000062 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	32,9 ± 1,1 y
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1952
Parnost	+

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

⁴³Ar

Maseni broj	43
neutron number	25
Relativna Atomska Masa	42,965636056 ± 0,0000057 Da
g-factor	−0,4088 ± 0,0024
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	5,37 ± 0,06 m
spin	5/2
nuclear quadrupole moment	0,142 ± 0,014
vrijeme otkrića ili izuma	1969
Parnost

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

⁴⁴Ar

Maseni broj	44
neutron number	26
Relativna Atomska Masa	43,964923814 ± 0,0000017 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	11,87 ± 0,05 m
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1969
Parnost	+

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

⁴⁵Ar

Maseni broj	45
neutron number	27
Relativna Atomska Masa	44,968039731 ± 0,00000055 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	21,48 ± 0,15 s
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1974
Parnost	-

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

⁴⁶Ar

Maseni broj	46
neutron number	28
Relativna Atomska Masa	45,968039244 ± 0,0000025 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	8,4 ± 0,6 s
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1974
Parnost	+

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

⁴⁷Ar

Maseni broj	47
neutron number	29
Relativna Atomska Masa	46,972767112 ± 0,0000013 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,23 ± 0,03 s
spin	3/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1985
Parnost

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

⁴⁸Ar

Maseni broj	48
neutron number	30
Relativna Atomska Masa	47,976001 ± 0,000018 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	415 ± 15 ms
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	2004
Parnost	+

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

⁴⁹Ar

Maseni broj	49
neutron number	31
Relativna Atomska Masa	48,981685 ± 0,000429 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	236 ± 8 ms
spin	3/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1989
Parnost	-

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

⁵⁰Ar

Maseni broj	50
neutron number	32
Relativna Atomska Masa	49,985797 ± 0,000537 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	106 ± 6 ms
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1989
Parnost	+

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

⁵¹Ar

Maseni broj	51
neutron number	33
Relativna Atomska Masa	50,993033 ± 0,000429 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	1/2
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1989
Parnost	-

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

⁵²Ar

Maseni broj	52
neutron number	34
Relativna Atomska Masa	51,998519 ± 0,000644 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	2009
Parnost	+

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

⁵³Ar

Maseni broj	53
neutron number	35
Relativna Atomska Masa	53,00729 ± 0,00075 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	2009
Parnost	-

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

⁵⁴Ar

Maseni broj	54
neutron number	36
Relativna Atomska Masa	54,013484 ± 0,000859 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	2018
Parnost	+

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

povijest

otkrio/izumio	Sir William Ramsey, Baron Rayleigh
location of discovery	Scotland
vrijeme otkrića ili izuma	1894
Etimologija	Greek: argos (inactive).
pronunciation	AR-gon (engleski)

source

Obilnost
Zastupljenost u Zemljinoj kori	3,5 mg/kg
natural abundance (ocean)	0,45 mg/L
natural abundance (tijelo)
natural abundance (meteoroid)
natural abundance (Sunce)	0,007 %
Zastupljenost u svemiru	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 Thesaurus ID	30962
BNF	119700051
Brockhaus Enzyklopädie online ID	argon
CAB ID	42654
CAS registarski broj	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
ECHA Substance Infocard ID	100.028.315
Encyclopædia Universalis ID	argon
E number	E938
Freebase ID	/m/027r9df
French Vikidia ID	Argon
GND identifikator	4142990-4
Gran Enciclopèdia Catalana ID	0004615
Great Russian Encyclopedia Online ID	1827507
Gujarati Vishwakosh entry	આગૉર્ન
HSDB ID	7902
ICSC ID	0154
ID oznaka teme na Quori	Argon-element
InChI	InChI=1S/Ar
InChIKey	XKRFYHLGVUSROY-UHFFFAOYSA-N
KBpedia ID	Argon
LCCN	sh85007108
Latvian National Encyclopedia Online ID	133180
MeSH ID	D001128
NDL ID	00575518
National Library of Israel J9U ID	987007295519905171
National Library of Latvia ID	000328279
OpenAlex ID	C547737533
OpenAlex ID	C2992172976
Open Food Facts ingredient ID	propellent-gas-e938
PDB ID	1C6F
PDB ID	1C6I
PDB ID	1C66
PDB ID	1C6C
PDB ligand ID	AR
PSH ID	5818
PubChem ID	23968
RxNorm ID	1368133
Römpp online ID	RD-01-03226
Spanish Vikidia ID	Argón
Store norske leksikon ID	argon
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 number	7180
značenje prema OmegaWiki	15591

Argon (Ar)

Physical Property

Kemijsko Svojstvo

other

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

povijest

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