Argon

Argon (Ar)

chemical element with symbol Ar and atomic number 18; rare gas
Atomic Number18
Atomic Weight39.948
mass number40
Group18
Period3
Blockp
proton18 p+
neutron22 n0
electron18 e-
Animated Bohr model of Ar (Argon)

Proprietat Fisica

Rai Atomic
71 pm
molar volume
covalent radius
96 pm
Metallic Radius
ionic radius
Crystal Radius
Rai de van der Waals
188 pm
densitat
0.001633 g/cm³
Atomic Radii Of The Elements: Argon020406080100120140160180200pmRai AtomicCovalent RadiusMetallic RadiusRai de van der Waals

Chemical Property

energia
proton affinity
369.2 kJ/mol
electron affinity
ionization energy
15.7596112 eV/particle
ionization energy of Ar (Argon)
enthalpy of vaporization
6.52 kJ/mol
enthalpy of fusion
standard enthalpy of formation
electron
electron shell2, 8, 8
Bohr model: Ar (Argon)
valence electron8
Lewis structure: Ar (Argon)
electron configuration[Ne] 3s2 3p6
1s2 2s2 2p6 3s2 3p6
Enhanced Bohr model of Ar (Argon)
Orbital Diagram of Ar (Argon)
oxidation number0
Electronegativitat
Electrophilicity Index
0.0832013314590371 eV/particle
fundamental state of matter
estat de la matèriaGas
gaseous state of matterMonoatomic
Boiling Point
87.302 K
Melting Point
83.81 K
critical pressure
4.863 MPa
critical temperature
150.687 K
Ponch triple
83.8058 K
68.89 kPa
appearance
Color
Colorless
appearancecolorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field
Indici de refraccion
1.000281
thermodynamic material property
Thermal Conductivity
0.0177 W/(m K)
thermal expansion
molar heat capacity
20.786 J/(mol K)
Specific Heat Capacity
heat capacity ratio5/3
electrical properties
type
electrical conductivity
electrical resistivity
superconductivity
magnetism
typediamagnetic
magnetic susceptibility (Mass)
-0.000000006 m³/Kg
magnetic susceptibility (Molar)
-0.00000000024 m³/mol
magnetic susceptibility (Volume)
-0.0000000107
magnetic ordering
Curie temperature
Néel temperature
estructura
Crystal StructureFace Centered Cubic (FCC)
lattice constant
5.26 Å
Lattice Anglesπ/2, π/2, π/2
mechanical property
Duretat
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
319 m/s
classification
CategoryNoble gases, Noble gases
CAS GroupVIII
IUPAC GroupVIIIA
Glawe Number3
Mendeleev Number114
Pettifor Number3
Geochemical Classvolatile
Goldschmidt classificationatmophile

other

Gas Basicity
346.3 kJ/mol
polarizability
11.083 ± 0.007 a₀
C6 Dispersion Coefficient
64.2 a₀
allotrope
Neutron cross section
0.66
Neutron Mass Absorption
0.00059
quantum number1S0
space group225 (Fm_3m)

Isotopes of Argon

Stable Isotopes2
Unstable Isotopes24
Natural Isotopes3
Isotopic Composition4099.60%4099.60%360.33%360.33%380.06%380.06%

29Ar

mass number29
neutron number11
relative atomic mass
29.040761 ± 0.000471 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
Espin5/2
nuclear quadrupole moment
data de descobèrta2018
parity+

decay modeintensity
2p (2-proton emission)100%

30Ar

mass number30
neutron number12
relative atomic mass
30.023694 ± 0.000192 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
Espin0
nuclear quadrupole moment
0
data de descobèrta2015
parity+

decay modeintensity
2p (2-proton emission)100%

31Ar

mass number31
neutron number13
relative atomic mass
31.012158 ± 0.000215 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
15 ± 0.3 ms
Espin5/2
nuclear quadrupole moment
data de descobèrta1986
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)68.3%
2p (2-proton emission)9%
B+pA0.38%
3p0.07%
β+α (β+-delayed α emission)0.03%
2p (2-proton emission)0.0006%

32Ar

mass number32
neutron number14
relative atomic mass
31.997637824 ± 0.0000019 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
98 ± 2 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta1977
parity+

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

33Ar

mass number33
neutron number15
relative atomic mass
32.989925545 ± 0.00000043 Da
g-factor
-1.446 ± 0.012
natural abundance
Radioactivitat☢️ radioactive element
Semivida
173 ± 2 ms
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1964
parity+

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

34Ar

mass number34
neutron number16
relative atomic mass
33.980270092 ± 0.000000083 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
846.46 ± 0.35 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta1966
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

35Ar

mass number35
neutron number17
relative atomic mass
34.975257719 ± 0.00000073 Da
g-factor
0.42133333333333 ± 0.00013333333333333
natural abundance
Radioactivitat☢️ radioactive element
Semivida
1.7756 ± 0.001 s
Espin3/2
nuclear quadrupole moment
-0.084 ± 0.015
data de descobèrta1940
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

36Ar

mass number36
neutron number18
relative atomic mass
35.967545106 ± 0.000000028 Da
g-factor
0
natural abundance
0.3336 ± 0.021
Radioactivitat☢️ radioactive element
Semivida
Espin0
nuclear quadrupole moment
0
data de descobèrta1920
parity+

decay modeintensity
+ (double β+ decay)

37Ar

mass number37
neutron number19
relative atomic mass
36.966776301 ± 0.000000221 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
35.011 ± 0.019 d
Espin3/2
nuclear quadrupole moment
0.076 ± 0.003
data de descobèrta1941
parity+

decay modeintensity
ϵ (electron capture)100%

38Ar

mass number38
neutron number20
relative atomic mass
37.962732102 ± 0.000000209 Da
g-factor
0
natural abundance
0.0629 ± 0.007
Radioactivitatstable isotope
SemividaNot Radioactive ☢️
Espin0
nuclear quadrupole moment
0
data de descobèrta1934
parity+

39Ar

mass number39
neutron number21
relative atomic mass
38.964313037 ± 0.000005367 Da
g-factor
-0.45428571428571 ± 0.0042857142857143
natural abundance
Radioactivitat☢️ radioactive element
Semivida
268 ± 8 y
Espin7/2
nuclear quadrupole moment
-0.116 ± 0.002
data de descobèrta1950
parity-

decay modeintensity
β (β decay)100%

40Ar

mass number40
neutron number22
relative atomic mass
39.96238312204 ± 0.00000000234 Da
g-factor
0
natural abundance
99.6035 ± 0.025
Radioactivitatstable isotope
SemividaNot Radioactive ☢️
Espin0
nuclear quadrupole moment
0
data de descobèrta1920
parity+

41Ar

mass number41
neutron number23
relative atomic mass
40.96450057 ± 0.000000372 Da
g-factor
-0.37428571428571 ± 0.0022857142857143
natural abundance
Radioactivitat☢️ radioactive element
Semivida
109.61 ± 0.04 m
Espin7/2
nuclear quadrupole moment
-0.042 ± 0.004
data de descobèrta1936
parity-

decay modeintensity
β (β decay)100%

42Ar

mass number42
neutron number24
relative atomic mass
41.963045737 ± 0.0000062 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
32.9 ± 1.1 y
Espin0
nuclear quadrupole moment
0
data de descobèrta1952
parity+

decay modeintensity
β (β decay)100%

43Ar

mass number43
neutron number25
relative atomic mass
42.965636056 ± 0.0000057 Da
g-factor
-0.4088 ± 0.0024
natural abundance
Radioactivitat☢️ radioactive element
Semivida
5.37 ± 0.06 m
Espin5/2
nuclear quadrupole moment
0.142 ± 0.014
data de descobèrta1969
parity

decay modeintensity
β (β decay)100%

44Ar

mass number44
neutron number26
relative atomic mass
43.964923814 ± 0.0000017 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
11.87 ± 0.05 m
Espin0
nuclear quadrupole moment
0
data de descobèrta1969
parity+

decay modeintensity
β (β decay)100%

45Ar

mass number45
neutron number27
relative atomic mass
44.968039731 ± 0.00000055 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
21.48 ± 0.15 s
Espin5/2
nuclear quadrupole moment
data de descobèrta1974
parity-

decay modeintensity
β (β decay)100%

46Ar

mass number46
neutron number28
relative atomic mass
45.968039244 ± 0.0000025 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
8.4 ± 0.6 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1974
parity+

decay modeintensity
β (β decay)100%

47Ar

mass number47
neutron number29
relative atomic mass
46.972767112 ± 0.0000013 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
1.23 ± 0.03 s
Espin3/2
nuclear quadrupole moment
data de descobèrta1985
parity

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)0.2%

48Ar

mass number48
neutron number30
relative atomic mass
47.976001 ± 0.000018 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
415 ± 15 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta2004
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)38%

49Ar

mass number49
neutron number31
relative atomic mass
48.981685 ± 0.000429 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
236 ± 8 ms
Espin3/2
nuclear quadrupole moment
data de descobèrta1989
parity-

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)29%
2n (2-neutron emission)

50Ar

mass number50
neutron number32
relative atomic mass
49.985797 ± 0.000537 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
106 ± 6 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta1989
parity+

decay modeintensity
β (β decay)100%
β n (β-delayed neutron emission)37%
2n (2-neutron emission)

51Ar

mass number51
neutron number33
relative atomic mass
50.993033 ± 0.000429 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1989
parity-

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

52Ar

mass number52
neutron number34
relative atomic mass
51.998519 ± 0.000644 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
Espin0
nuclear quadrupole moment
0
data de descobèrta2009
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

53Ar

mass number53
neutron number35
relative atomic mass
53.00729 ± 0.00075 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
Espin5/2
nuclear quadrupole moment
data de descobèrta2009
parity-

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)

54Ar

mass number54
neutron number36
relative atomic mass
54.013484 ± 0.000859 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
Espin0
nuclear quadrupole moment
0
data de descobèrta2018
parity+

decay modeintensity
β (β decay)
β n (β-delayed neutron emission)
2n (2-neutron emission)
Argon ice 1

istòria

descobridor o inventaireSir William Ramsey, Baron Rayleigh
luòc de descobèrtaScotland
data de descobèrta1894
EtimologiaGreek: argos (inactive).
pronunciationAR-gon (English)

source

Abundance
Abundance in Earth's crust
3.5 mg/kg
natural abundance (Ocean)
0.45 mg/L
natural abundance (còs uman)
natural abundance (meteoroid)
natural abundance (Solelh)
0.007 %
Abundance in Universe
0.02 %

Nuclear Screening Constants

1s0.4925
2p3.9918
2s5.7696
3p11.2359
3s10.2432