Argon (Ar)

Argon is the 18th element in the periodic table and has a symbol of Ar and atomic number of 18. It has an atomic weight of 39.948 and a mass number of 40. Argon has eighteen protons and twenty-two neutrons in its nucleus, and eighteen electrons in three shells. It is located in group eighteen, period three and block p of the periodic table. Monatomic noble gas. Makes up 0.93% of the air. Colourless, odorless. Is inert and has no true compounds. Lord Rayleigh and Sir william Ramsey identified argon in 1894.

Atomic Number	18
Atomic Weight	39.948
Mass Number	40

Group	18
Period	3
Block	p

Protons	18 p⁺
Neutrons	22 n⁰
Electrons	18 e^-

Physical Properties

Atomic Radius	71 pm 197 pm
Molar Volume	24.2 cm³/mol
Covalent Radius	96 pm 107 pm 96 pm 106 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius	188 pm 188 pm 199 pm 386.8 pm
Density	0.001633 g/cm³

Chemical Properties

Energy

Proton Affinity	369.2 kJ/mol
Electron Affinity	-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

Heat of Vaporization	6.52 kJ/mol
Heat of Fusion
Heat of Formation
Electrons

Electron Shells	2, 8, 8

Valence Electrons	8 ⓘ

Electron Configuration	[Ne] 3s² 3p⁶ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶

Oxidation States	0
Electronegativity	19.17 eV/particle 0.2922
Electrophilicity Index	0.0832013314590371 eV/particle
States of Matter

Phase	Gas
Gas Phase	Monoatomic
Boiling Point	87.302 K
Melting Point	83.81 K
Critical Pressure	4.863 MPa
Critical Temperature	150.687 K
Triple Point	83.8058 K 68.89 kPa
Visual
Argon is a Colorless. Ar has a CPK of #ff1493, Jmol of #80d1e3, and MOLCAS GV of #80d1e3. The Appearance of Element 18 is colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field. The Refractive Index of Argon (Ar) is 1.000281.
Color	Colorless #ff1493 #80d1e3 #80d1e3
Appearance	colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field
Refractive Index	1.000281
Thermodynamic Properties
Thermal Conductivity	0.0177 W/(m K)
Thermal Expansion
Molar Heat Capacity	20.786 J/(mol K)
Specific Heat Capacity	0.52 J/(g⋅K)
Heat Capacity Ratio (Adiabatic Index)	5/3
Electrical Properties
Type
Electrical Conductivity
Electrical Resistivity
Superconducting Point
Magnetism
Type	diamagnetic
Magnetic Susceptibility (Mass)	-0.000000006 m³/Kg
Magnetic Susceptibility (Molar)	-0.00000000024 m³/mol
Magnetic Susceptibility (Volume)	-0.0000000107
Magnetic Ordering
Curie Point
Neel Point
Structure
The Crystal Structure of Argon is FCC. The lattice constant of Ar is 5.26 Å. The lattice angles of Element 18 are π/2, π/2, π/2.
Crystal Structure	Face Centered Cubic (FCC)
Lattice Constant	5.26 Å
Lattice Angles	π/2, π/2, π/2
Mechanical Properties
The Speed of Sound of Argon is 319 m/s.
Hardness
Bulk Modulus
Shear Modulus
Young's Modulus
Poisson Ratio
Speed of Sound	319 m/s
Classification
The CAS Group of Argon is VIII. The IUPAC Group of Ar is VIIIA. The Glawe Number of Element 18 is 3. The Mendeleev Number of Argon (Ar) is 114. The Pettifor Number of Argon is 3. The Geochemical Class of Ar is volatile. The Goldschmidt Class of Element 18 is atmophile.
Category	Noble gases, Noble gases
CAS Group	VIII
IUPAC Group	VIIIA
Glawe Number	3
Mendeleev Number	114
Pettifor Number	3
Geochemical Class	volatile
Goldschmidt Class	atmophile

Other

The Gas Basicity of Argon is 346.3 kJ/mol. The Dipole Polarizability of Ar is 11.083 plus or minus 0.007 a₀. Element 18 has a C6 Dispersion Coefficient (CD) of 64.2 a₀, and C6 Dispersion Coefficient (GB) of 67.4 a₀. The Allotropes of Argon (Ar) is . The Neutron Cross Section of Argon is 0.66. The Neutron Mass Absorption of Ar is 0.00059. The Quantum Numbers of Element 18 is 1S0. The Space Group of Argon (Ar) is 225 (Fm_3m).

Gas Basicity	346.3 kJ/mol
Dipole Polarizability	11.083 ± 0.007 a₀
C6 Dispersion Coefficient	64.2 a₀ 67.4 a₀
Allotropes
Neutron Cross Section	0.66
Neutron Mass Absorption	0.00059
Quantum Numbers	1S0
Space Group	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
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year	2018
Parity	+

Decay Mode	Intensity
2p (2-proton emission)	100%

³⁰Ar

Mass Number	30
Neutron Number	12
Relative Atomic Mass	30.023694 ± 0.000192 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	2015
Parity	+

Decay Mode	Intensity
2p (2-proton emission)	100%

³¹Ar

Mass Number	31
Neutron Number	13
Relative Atomic Mass	31.012158 ± 0.000215 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	15 ± 0.3 ms
Spin	5/2
Quadrupole Moment
Discovery Year	1986
Parity	+

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

Mass Number	32
Neutron Number	14
Relative Atomic Mass	31.997637824 ± 0.0000019 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	98 ± 2 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1977
Parity	+

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life	173 ± 2 ms
Spin	1/2
Quadrupole Moment	0
Discovery Year	1964
Parity	+

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life	846.46 ± 0.35 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1966
Parity	+

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life	1.7756 ± 0.001 s
Spin	3/2
Quadrupole Moment	-0.084 ± 0.015
Discovery Year	1940
Parity	+

Decay Mode	Intensity
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
Abundance	0.3336 ± 0.021
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	1920
Parity	+

Decay Mode	Intensity
2β⁺ (double β⁺ decay)

³⁷Ar

Mass Number	37
Neutron Number	19
Relative Atomic Mass	36.966776301 ± 0.000000221 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	35.011 ± 0.019 d
Spin	3/2
Quadrupole Moment	0.076 ± 0.003
Discovery Year	1941
Parity	+

Decay Mode	Intensity
ϵ (electron capture)	100%

³⁸Ar

Mass Number	38
Neutron Number	20
Relative Atomic Mass	37.962732102 ± 0.000000209 Da
G-Factor	0
Abundance	0.0629 ± 0.007
Radioactivity	Stable
Half Life	Not Radioactive ☢️
Spin	0
Quadrupole Moment	0
Discovery Year	1934
Parity	+

³⁹Ar

Mass Number	39
Neutron Number	21
Relative Atomic Mass	38.964313037 ± 0.000005367 Da
G-Factor	-0.45428571428571 ± 0.0042857142857143
Abundance
Radioactivity	☢️ Radioactive
Half Life	268 ± 8 y
Spin	7/2
Quadrupole Moment	-0.116 ± 0.002
Discovery Year	1950
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴⁰Ar

Mass Number	40
Neutron Number	22
Relative Atomic Mass	39.96238312204 ± 0.00000000234 Da
G-Factor	0
Abundance	99.6035 ± 0.025
Radioactivity	Stable
Half Life	Not Radioactive ☢️
Spin	0
Quadrupole Moment	0
Discovery Year	1920
Parity	+

⁴¹Ar

Mass Number	41
Neutron Number	23
Relative Atomic Mass	40.96450057 ± 0.000000372 Da
G-Factor	-0.37428571428571 ± 0.0022857142857143
Abundance
Radioactivity	☢️ Radioactive
Half Life	109.61 ± 0.04 m
Spin	7/2
Quadrupole Moment	-0.042 ± 0.004
Discovery Year	1936
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴²Ar

Mass Number	42
Neutron Number	24
Relative Atomic Mass	41.963045737 ± 0.0000062 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	32.9 ± 1.1 y
Spin	0
Quadrupole Moment	0
Discovery Year	1952
Parity	+

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life	5.37 ± 0.06 m
Spin	5/2
Quadrupole Moment	0.142 ± 0.014
Discovery Year	1969
Parity

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴⁴Ar

Mass Number	44
Neutron Number	26
Relative Atomic Mass	43.964923814 ± 0.0000017 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	11.87 ± 0.05 m
Spin	0
Quadrupole Moment	0
Discovery Year	1969
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴⁵Ar

Mass Number	45
Neutron Number	27
Relative Atomic Mass	44.968039731 ± 0.00000055 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	21.48 ± 0.15 s
Spin	5/2
Quadrupole Moment
Discovery Year	1974
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴⁶Ar

Mass Number	46
Neutron Number	28
Relative Atomic Mass	45.968039244 ± 0.0000025 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	8.4 ± 0.6 s
Spin	0
Quadrupole Moment	0
Discovery Year	1974
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

⁴⁷Ar

Mass Number	47
Neutron Number	29
Relative Atomic Mass	46.972767112 ± 0.0000013 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	1.23 ± 0.03 s
Spin	3/2
Quadrupole Moment
Discovery Year	1985
Parity

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life	415 ± 15 ms
Spin	0
Quadrupole Moment	0
Discovery Year	2004
Parity	+

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life	236 ± 8 ms
Spin	3/2
Quadrupole Moment
Discovery Year	1989
Parity	-

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life	106 ± 6 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1989
Parity	+

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	1/2
Quadrupole Moment	0
Discovery Year	1989
Parity	-

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	2009
Parity	+

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	5/2
Quadrupole Moment
Discovery Year	2009
Parity	-

Decay Mode	Intensity
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
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year	2018
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

History

Argon was suspected to be present in air by Henry Cavendish in 1785. It was not isolated until 1894 by Lord Rayleigh and Sir William Ramsay in Scotland. Argon became the first member of the noble gases to be discovered. In 1957, IUPAC agreed that the symbol should change from A to Ar. From the Greek argos, inactive

Discoverers	Sir William Ramsey, Baron Rayleigh
Discovery Location	Scotland
Discovery Year	1894
Etymology (Name Origin)	Greek: argos (inactive).
Pronunciation	AR-gon (English)

Argon is considered to be non-toxic

Argon makes a distinctive blue-green gas laser

Uses

Argon gas is used to fill conventional incandescent and fluorescent light bulbs. Argon is also used as an inert gas shield for arc welding and cutting, as blanket for the production of titanium and other reactive elements. It is used as a protective atmosphere for growing silicon and germanium crystals. Used in lighting products. It is often used in filling incandescent light bulbs. Some is mixed with krypton in fluorescent lamps. Crystals in the semiconductor industry are grown in argon atmospheres.

Sources

Continuously released into the air by decay of radioactive potassium-40. Pure form is obtained from fractional distillation of liquid air.

Abundance
Abundance in Earth's crust	3.5 mg/kg
Natural Abundance (Oceans)	0.45 mg/L
Natural Abundance (Human Body)
Natural Abundance (Meteor)
Natural Abundance (Sun)	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

Also Known As

Ar
element 18
18Ar

Translations

Italianargon
Norwegian Bokmålargon
Frenchargon
GermanArgon
Polishargon
Dutchargon
Spanishargón
Chinese (Traditional)氬
Afrikaansargon
Amharicአርገን
AragoneseArgón
Arabicأرغون
AsturianArgón
AzerbaijaniArqon
BashkirАргон
BelarusianАргон
Bulgarianаргон
Banglaআর্গন
BretonArgon
Bosnianargon
Catalanargó
CorsicanArgone
Czechargon
ChuvashАргон
Welshargon
Danishargon
ZazaArgon
Greekαργό
Esperantoargono
Estonianargoon
Basqueargon
Persianآرگون
Finnishargon
Northern FrisianArgon
FriulianArgon
Western FrisianArgon
IrishArgón
Galicianargon
GuaraniTatapu'ã'ỹ
Manxargon
Hakka ChineseArgon
Hawaiian‘Aragona
Hebrewארגון
Hindiआर्गन
Fiji HindiArgon
CroatianArgon
Haitian CreoleAgon
Hungarianargon
Armenianարգոն
Interlinguaargon
Indonesianargon
Idoargono
Icelandicargon
Japaneseアルゴン
Lojbanlaznynavni
JavaneseArgon
Georgianარგონი
KazakhАргон
Kannadaಆರ್ಗಾನ್
Korean아르곤
KomiАргон
Latinargon
LuxembourgishArgon
LimburgishArgon
LigurianArgon
LithuanianArgonas
Latvianargons
Māoriargon
MacedonianАргон
Malayalamആർഗോൺ
Mongolianаргон
Marathiआरगॉन
Western MariАргон
Malayargon
Low GermanArgon
Nepaliआर्गन
Norwegian Nynorskargon
NavajoNíłchʼi Dootłʼizhí
OccitanArgon
Punjabiਆਰਗਾਨ
PapiamentoArgon
Western Panjabiآرگون
Portugueseárgon
QuechuaArgun
Romanianargon
Russianаргон
RusynАрґон
Sicilianargon
Serbo-CroatianArgon
Sinhalaආගන්
Slovakargón
Slovenianargon
AlbanianArgoni
Serbianаргон
Saterland FrisianArgon
Swedishargon
SwahiliArigoni
Tamilஆர்கான்
Thaiอาร์กอน
TagalogArgon
TurkishArgon
Uyghurئارگون
Ukrainianаргон
UzbekArgon
VepsArgon
Vietnameseagon
WarayArgon
KalmykАрһон
Yiddishארגאן
YorubaArgon
Chinese氬
CebuanoArgon
Central Kurdishئارگۆن
Odiaଆର୍ଗନ
Gujaratiઆર્ગોન
Tatarаргон
PampangaArgon
Scotsargon
Chinese (China)氩
Chinese (Hong Kong SAR China)氬
Cantonese氬
Newariआर्गन
ErzyaАргон
SomaliAargon
Literary Chinese氬
Belarusian (Taraskievica orthography)аргон
AromanianArgon
Church SlavicАргонъ
FaroeseArgon
KyrgyzАргон
cdoĀ
Min Nan ChineseArgon
Teluguఆర్గాన్
Scottish GaelicArgon
Sanskritआर्गन
LombardArgon
Malteseargon
Gan Chinese氬
Paliआर्गन
English (United Kingdom)argon
TajikАргон
SundaneseArgon
Bhojpuriआर्गन
Tibetanགཉུག་རླུང་།
Portuguese (Brazil)argônio
Lingua Franca Novaargon
Tatar (Cyrillic)аргон
Burmeseအာဂွန်
oloArgon
kbpArɩkɔŋ
Wu Chinese氩
Chinese (Taiwan)氬
PiedmonteseÀrgon
Chinese (Simplified)氩
Chinese (Singapore)氩
Chinese (Malaysia)氩
Chinese (Macao SAR China)氬
SardinianArgòn
Moroccan Arabicآرݣون
German (Switzerland)Argon
English (Canada)Argon
Egyptian Arabicارجون
Pashtoآرگون
BikolArgon
CornishArgon
Manipuriꯑꯥꯔꯒꯣꯟ
BalineseArgon
Urduآرگون
Sindhiآرگون
Malay (Arabic)ارݢون
Northern Samiargon
Inari Samiargon
blkအာဂွန်
ZuluIsAlahwe

Argon on ChemicalAid

Art & Architecture Thesaurus ID	300133261
Australian Educational Vocabulary ID	scot/1608
BNCF Thesaurus ID	30962
Bibliothèque nationale de France ID	119700051
Brockhaus Enzyklopädie online ID	argon
CAB ID	42654
CAS Registry Number	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 ID	4142990-4
Gran Enciclopèdia Catalana ID	0004615
Great Russian Encyclopedia Online ID	1827507
Gujarati Vishwakosh entry	આગૉર્ન
HSDB ID	7902
ICSC ID	0154
InChI	InChI=1S/Ar
InChIKey	XKRFYHLGVUSROY-UHFFFAOYSA-N
KBpedia ID	Argon
Latvian National Encyclopedia Online ID	133180
Library of Congress authority ID	sh85007108
MeSH descriptor ID	D001128
NDL Authority ID	00575518
National Library of Israel J9U ID	987007295519905171
National Library of Latvia ID	000328279
OmegaWiki Defined Meaning	15591
OpenAlex ID	C547737533
OpenAlex ID	C2992172976
Open Food Facts ingredient ID	propellent-gas-e938
PDB ligand ID	AR
PDB structure ID	1C6F
PDB structure ID	1C6I
PDB structure ID	1C66
PDB structure ID	1C6C
PSH ID	5818
PubChem CID	23968
Quora topic ID	Argon-element
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

Argon (Ar)

Physical Properties

Chemical Properties

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