Argó

Argó (Ar)

chemical element with symbol Ar and atomic number 18; rare gas
Atomic Number18
Atomic Weight39.948
Rhif màs40
Group18
Period3
Blockp
Proton18 p+
Niwtron22 n0
Electron18 e-
Animated Bohr model of Ar (Argó)

Nodwedd Ffisegol

Atomic Radius
71 pm
molar volume
covalent radius
96 pm
Metallic Radius
ionic radius
Crystal Radius
Van der Waals radius
188 pm
density
0.001633 g/cm³
Atomic Radii Of The Elements: Argó0102030405060708090100110120130140150160170180190pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals radius

Nodwedd Gemegol

egni
proton affinity
369.2 kJ/mol
electron affinity
ionization energy
15.7596112 eV/particle
ionization energy of Ar (Argó)
enthalpy of vaporization
6.52 kJ/mol
enthalpy of fusion
standard enthalpy of formation
Electron
plisgyn yr electron2, 8, 8
Bohr model: Ar (Argó)
valence electron8
Lewis structure: Ar (Argó)
trefn yr electronnau[Ne] 3s2 3p6
1s2 2s2 2p6 3s2 3p6
Enhanced Bohr model of Ar (Argó)
Orbital Diagram of Ar (Argó)
Cyflwr ocsidiad0
Electronegatifedd
Electrophilicity Index
0.0832013314590371 eV/particle
cyflwr sylfaenol mater
cyflwr materGas
gaseous state of matterMonoatomic
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
appearance
lliw
Colorless
appearancecolorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field
Mynegrif plygiant
1.000281
nodwedd ffisegol gwrthrych
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
dargludedd trydanol
Gwrthedd
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
strwythur
Crystal StructureFace Centered Cubic (FCC)
lattice constant
5.26 Å
Lattice Anglesπ/2, π/2, π/2
nodwedd mecanyddol deunyddiau
hardness
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

Rhif màs29
neutron number11
relative atomic mass
29.040761 ± 0.000471 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin5/2
nuclear quadrupole moment
dyddiad darganfod2018
parity+

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

30Ar

Rhif màs30
neutron number12
relative atomic mass
30.023694 ± 0.000192 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod2015
parity+

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

31Ar

Rhif màs31
neutron number13
relative atomic mass
31.012158 ± 0.000215 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
15 ± 0.3 ms
spin5/2
nuclear quadrupole moment
dyddiad darganfod1986
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

Rhif màs32
neutron number14
relative atomic mass
31.997637824 ± 0.0000019 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
98 ± 2 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1977
parity+

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

33Ar

Rhif màs33
neutron number15
relative atomic mass
32.989925545 ± 0.00000043 Da
g-factor
-1.446 ± 0.012
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
173 ± 2 ms
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1964
parity+

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

34Ar

Rhif màs34
neutron number16
relative atomic mass
33.980270092 ± 0.000000083 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
846.46 ± 0.35 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1966
parity+

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

35Ar

Rhif màs35
neutron number17
relative atomic mass
34.975257719 ± 0.00000073 Da
g-factor
0.42133333333333 ± 0.00013333333333333
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
1.7756 ± 0.001 s
spin3/2
nuclear quadrupole moment
-0.084 ± 0.015
dyddiad darganfod1940
parity+

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

36Ar

Rhif màs36
neutron number18
relative atomic mass
35.967545106 ± 0.000000028 Da
g-factor
0
natural abundance
0.3336 ± 0.021
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod1920
parity+

decay modeintensity
+ (double β+ decay)

37Ar

Rhif màs37
neutron number19
relative atomic mass
36.966776301 ± 0.000000221 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
35.011 ± 0.019 d
spin3/2
nuclear quadrupole moment
0.076 ± 0.003
dyddiad darganfod1941
parity+

decay modeintensity
ϵ (electron capture)100%

38Ar

Rhif màs38
neutron number20
relative atomic mass
37.962732102 ± 0.000000209 Da
g-factor
0
natural abundance
0.0629 ± 0.007
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dyddiad darganfod1934
parity+

39Ar

Rhif màs39
neutron number21
relative atomic mass
38.964313037 ± 0.000005367 Da
g-factor
-0.45428571428571 ± 0.0042857142857143
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
268 ± 8 y
spin7/2
nuclear quadrupole moment
-0.116 ± 0.002
dyddiad darganfod1950
parity-

decay modeintensity
β (β decay)100%

40Ar

Rhif màs40
neutron number22
relative atomic mass
39.96238312204 ± 0.00000000234 Da
g-factor
0
natural abundance
99.6035 ± 0.025
Dadfeilio ymbelydrolstable isotope
Hanner oesNot Radioactive ☢️
spin0
nuclear quadrupole moment
0
dyddiad darganfod1920
parity+

41Ar

Rhif màs41
neutron number23
relative atomic mass
40.96450057 ± 0.000000372 Da
g-factor
-0.37428571428571 ± 0.0022857142857143
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
109.61 ± 0.04 m
spin7/2
nuclear quadrupole moment
-0.042 ± 0.004
dyddiad darganfod1936
parity-

decay modeintensity
β (β decay)100%

42Ar

Rhif màs42
neutron number24
relative atomic mass
41.963045737 ± 0.0000062 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
32.9 ± 1.1 y
spin0
nuclear quadrupole moment
0
dyddiad darganfod1952
parity+

decay modeintensity
β (β decay)100%

43Ar

Rhif màs43
neutron number25
relative atomic mass
42.965636056 ± 0.0000057 Da
g-factor
-0.4088 ± 0.0024
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
5.37 ± 0.06 m
spin5/2
nuclear quadrupole moment
0.142 ± 0.014
dyddiad darganfod1969
parity

decay modeintensity
β (β decay)100%

44Ar

Rhif màs44
neutron number26
relative atomic mass
43.964923814 ± 0.0000017 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
11.87 ± 0.05 m
spin0
nuclear quadrupole moment
0
dyddiad darganfod1969
parity+

decay modeintensity
β (β decay)100%

45Ar

Rhif màs45
neutron number27
relative atomic mass
44.968039731 ± 0.00000055 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
21.48 ± 0.15 s
spin5/2
nuclear quadrupole moment
dyddiad darganfod1974
parity-

decay modeintensity
β (β decay)100%

46Ar

Rhif màs46
neutron number28
relative atomic mass
45.968039244 ± 0.0000025 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
8.4 ± 0.6 s
spin0
nuclear quadrupole moment
0
dyddiad darganfod1974
parity+

decay modeintensity
β (β decay)100%

47Ar

Rhif màs47
neutron number29
relative atomic mass
46.972767112 ± 0.0000013 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
1.23 ± 0.03 s
spin3/2
nuclear quadrupole moment
dyddiad darganfod1985
parity

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

48Ar

Rhif màs48
neutron number30
relative atomic mass
47.976001 ± 0.000018 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
415 ± 15 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod2004
parity+

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

49Ar

Rhif màs49
neutron number31
relative atomic mass
48.981685 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
236 ± 8 ms
spin3/2
nuclear quadrupole moment
dyddiad darganfod1989
parity-

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

50Ar

Rhif màs50
neutron number32
relative atomic mass
49.985797 ± 0.000537 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
106 ± 6 ms
spin0
nuclear quadrupole moment
0
dyddiad darganfod1989
parity+

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

51Ar

Rhif màs51
neutron number33
relative atomic mass
50.993033 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin1/2
nuclear quadrupole moment
0
dyddiad darganfod1989
parity-

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

52Ar

Rhif màs52
neutron number34
relative atomic mass
51.998519 ± 0.000644 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod2009
parity+

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

53Ar

Rhif màs53
neutron number35
relative atomic mass
53.00729 ± 0.00075 Da
g-factor
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin5/2
nuclear quadrupole moment
dyddiad darganfod2009
parity-

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

54Ar

Rhif màs54
neutron number36
relative atomic mass
54.013484 ± 0.000859 Da
g-factor
0
natural abundance
Dadfeilio ymbelydrol☢️ elfen ymbelydrol
Hanner oes
spin0
nuclear quadrupole moment
0
dyddiad darganfod2018
parity+

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

hanes

darganfyddwr neu ddyfeisiwrSir William Ramsey, Baron Rayleigh
man darganfodScotland
dyddiad darganfod1894
geirdarddiadGreek: argos (inactive).
ynganiadAR-gon (Saesneg)

source

Abundance
Abundance in Earth's crust
3.5 mg/kg
natural abundance (cefnfor)
0.45 mg/L
natural abundance (corff dynol)
natural abundance (Awyrfaen)
natural abundance (Haul)
0.007 %
Abundance in Universe
0.02 %

Nuclear Screening Constants

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