Argon

Argon (Ar)

grundämne
Atomnummer18
Atommassa39.948
masstal40
Grupp18
Period3
Blockp
Protoner18 p+
Neutroner22 n0
Electrons18 e-
Animated Bohrs atommodell of Ar (Argon)

Egenskaper

fysisk egenskap
atomradie
71 pm
molvolym
24,2 cm³/mol
kovalent radie
96 pm
Metallic Radius
ionic radius
Crystal Radius
Van der Waalsradie
188 pm
densitet
0,001633 g/cm³
energi
proton affinity
369,2 kJ/mol
Elektronaffinitet
−11,5 eV/particle
joniseringsenergi
15,7596112 eV/particle
joniseringsenergi of Ar (Argon)
ångbildningsvärme
6,52 kJ/mol
smältvärme
Bildningsentalpi
Electrons
electron shell2, 8, 8
Bohrs atommodell: Ar (Argon)
valenselektron8
Elektronformel: Ar (Argon)
elektronkonfiguration[Ne] 3s2 3p6
Enhanced Bohrs atommodell of Ar (Argon)
Orbital Diagram of Ar (Argon)
oxidationstal0
elektronegativitet
Electrophilicity
0,0832013314590371 eV/particle
Phases
aggregationstillståndGasformig
Gas PhaseMonoatomic
Kokpunkt
87,302 K
Smältpunkt
83,81 K
critical pressure
4,863 MPa
critical temperature
150,687 K
trippelpunkt
83,8058 K
68,89 kPa
Visual
färg
Färglös
appearancecolorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field
Brytningsindex
1,000281
materialegenskap
Värmeledningsförmåga
0,0177 W/(m K)
termisk expansion
molar heat capacity
20,786 J/(mol K)
Specifik värmekapacitet
0,52 J/(g⋅K)
heat capacity ratio5/3
electrical properties
type
elektrisk konduktivitet
resistivitet
supraledare
magnetism
typediamagnetic
magnetisk susceptibilitet (Mass)
−0,000000006 m³/Kg
magnetisk susceptibilitet (Molar)
−0,00000000024 m³/mol
magnetisk susceptibilitet (Volume)
−0,0000000107
magnetic ordering
Curiepunkten
Néel temperature
Structure
KristallstrukturYtcentrerat kubiskt (FCC)
Gitterkonstant
5,26 Å
Lattice Anglesπ/2, π/2, π/2
mekanisk materialegenskap
hårdhet
Kompressibilitet
skjuvmodul
Young's modulus
Poissons konstant
ljudhastighet
319 m/s
klassificering
KategoriÄdelgaser, Noble gases
CAS GroupVIII
IUPAC GroupVIIIA
Glawe Number3
Mendeleev Number114
Pettifor Number3
Geochemical Classvolatile
Goldschmidt classificationatmophile
övrigt
Gas Basicity
346,3 kJ/mol
Dipole Polarizability
11,083 ± 0,007 a₀
C6 Dispersion Coefficient
64,2 a₀
Allotropes
Träffyta
0,66
Neutron Mass Absorption
0,00059
kvanttal1S0
rymdgrupp225 (Fm_3m)

Argonisotoper

Stabila isotoper3
Instabila isotoper23
Radioactive Isotopes22

29Ar

natural abundance
relative atomic mass
29,040761 ± 0,000471 Da
masstal29
g-factor
Halveringstid
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum2018
Paritet+
29Ar Decay Modes
decay modeIntensitet
2p (2-proton emission)100%

30Ar

natural abundanceRadioactive ☢️
relative atomic mass
30,023694 ± 0,000192 Da
masstal30
g-factor
0
Halveringstid
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum2015
Paritet+
30Ar Decay Modes
decay modeIntensitet
2p (2-proton emission)100%

31Ar

natural abundanceRadioactive ☢️
relative atomic mass
31,012158 ± 0,000215 Da
masstal31
g-factor
Halveringstid
15 ± 0,3 ms
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum1986
Paritet+
31Ar Decay Modes
decay modeIntensitet
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

natural abundanceRadioactive ☢️
relative atomic mass
31,997637824 ± 0,0000019 Da
masstal32
g-factor
0
Halveringstid
98 ± 2 ms
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1977
Paritet+
32Ar Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)35.58%

33Ar

natural abundanceRadioactive ☢️
relative atomic mass
32,989925545 ± 0,00000043 Da
masstal33
g-factor
−1,446 ± 0,012
Halveringstid
173 ± 2 ms
Spinn1/2
nuclear quadrupole moment
0
upptäcktsdatum1964
Paritet+
33Ar Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)38.7%

34Ar

natural abundanceRadioactive ☢️
relative atomic mass
33,980270092 ± 0,000000083 Da
masstal34
g-factor
0
Halveringstid
846,46 ± 0,35 ms
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1966
Paritet+
34Ar Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%

35Ar

natural abundanceRadioactive ☢️
relative atomic mass
34,975257719 ± 0,00000073 Da
masstal35
g-factor
0,42133333333333 ± 0,00013333333333333
Halveringstid
1,7756 ± 0,001 s
Spinn3/2
nuclear quadrupole moment
−0,084 ± 0,015
upptäcktsdatum1940
Paritet+
35Ar Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%

36Ar

natural abundance
0,3336 ± 0,021
relative atomic mass
35,967545106 ± 0,000000028 Da
masstal36
g-factor
0
Halveringstid
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1920
Paritet+
36Ar Decay Modes
decay modeIntensitet
2β+ (double β+ decay)%

37Ar

natural abundanceRadioactive ☢️
relative atomic mass
36,966776301 ± 0,000000221 Da
masstal37
g-factor
Halveringstid
35,011 ± 0,019 d
Spinn3/2
nuclear quadrupole moment
0,076 ± 0,003
upptäcktsdatum1941
Paritet+
37Ar Decay Modes
decay modeIntensitet
ϵ (electron capture)100%

38Ar

natural abundance
0,0629 ± 0,007
relative atomic mass
37,962732102 ± 0,000000209 Da
masstal38
g-factor
0
Halveringstid
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1934
Paritet+

39Ar

natural abundanceRadioactive ☢️
relative atomic mass
38,964313037 ± 0,000005367 Da
masstal39
g-factor
−0,45428571428571 ± 0,0042857142857143
Halveringstid
268 ± 8 y
Spinn7/2
nuclear quadrupole moment
−0,116 ± 0,002
upptäcktsdatum1950
Paritet-
39Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%

40Ar

natural abundance
99,6035 ± 0,025
relative atomic mass
39,96238312204 ± 0,00000000234 Da
masstal40
g-factor
0
Halveringstid
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1920
Paritet+

41Ar

natural abundanceRadioactive ☢️
relative atomic mass
40,96450057 ± 0,000000372 Da
masstal41
g-factor
−0,37428571428571 ± 0,0022857142857143
Halveringstid
109,61 ± 0,04 m
Spinn7/2
nuclear quadrupole moment
−0,042 ± 0,004
upptäcktsdatum1936
Paritet-
41Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%

42Ar

natural abundanceRadioactive ☢️
relative atomic mass
41,963045737 ± 0,0000062 Da
masstal42
g-factor
0
Halveringstid
32,9 ± 1,1 y
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1952
Paritet+
42Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%

43Ar

natural abundanceRadioactive ☢️
relative atomic mass
42,965636056 ± 0,0000057 Da
masstal43
g-factor
−0,4088 ± 0,0024
Halveringstid
5,37 ± 0,06 m
Spinn5/2
nuclear quadrupole moment
0,142 ± 0,014
upptäcktsdatum1969
Paritet
43Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%

44Ar

natural abundanceRadioactive ☢️
relative atomic mass
43,964923814 ± 0,0000017 Da
masstal44
g-factor
0
Halveringstid
11,87 ± 0,05 m
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1969
Paritet+
44Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%

45Ar

natural abundanceRadioactive ☢️
relative atomic mass
44,968039731 ± 0,00000055 Da
masstal45
g-factor
Halveringstid
21,48 ± 0,15 s
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum1974
Paritet-
45Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%

46Ar

natural abundanceRadioactive ☢️
relative atomic mass
45,968039244 ± 0,0000025 Da
masstal46
g-factor
0
Halveringstid
8,4 ± 0,6 s
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1974
Paritet+
46Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%

47Ar

natural abundanceRadioactive ☢️
relative atomic mass
46,972767112 ± 0,0000013 Da
masstal47
g-factor
Halveringstid
1,23 ± 0,03 s
Spinn3/2
nuclear quadrupole moment
upptäcktsdatum1985
Paritet
47Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%
β− n (β−-delayed neutron emission)0.2%

48Ar

natural abundanceRadioactive ☢️
relative atomic mass
47,976001 ± 0,000018 Da
masstal48
g-factor
0
Halveringstid
415 ± 15 ms
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum2004
Paritet+
48Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%
β− n (β−-delayed neutron emission)38%

49Ar

natural abundanceRadioactive ☢️
relative atomic mass
48,981685 ± 0,000429 Da
masstal49
g-factor
Halveringstid
236 ± 8 ms
Spinn3/2
nuclear quadrupole moment
upptäcktsdatum1989
Paritet-
49Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%
β− n (β−-delayed neutron emission)29%
2n (2-neutron emission)%

50Ar

natural abundanceRadioactive ☢️
relative atomic mass
49,985797 ± 0,000537 Da
masstal50
g-factor
0
Halveringstid
106 ± 6 ms
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1989
Paritet+
50Ar Decay Modes
decay modeIntensitet
β− (β− decay)100%
β− n (β−-delayed neutron emission)37%
2n (2-neutron emission)%

51Ar

natural abundanceRadioactive ☢️
relative atomic mass
50,993033 ± 0,000429 Da
masstal51
g-factor
Halveringstid
Spinn1/2
nuclear quadrupole moment
0
upptäcktsdatum1989
Paritet-
51Ar Decay Modes
decay modeIntensitet
β− (β− decay)%
β− n (β−-delayed neutron emission)%
2n (2-neutron emission)%

52Ar

natural abundanceRadioactive ☢️
relative atomic mass
51,998519 ± 0,000644 Da
masstal52
g-factor
0
Halveringstid
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum2009
Paritet+
52Ar Decay Modes
decay modeIntensitet
β− (β− decay)%
β− n (β−-delayed neutron emission)%
2n (2-neutron emission)%

53Ar

natural abundanceRadioactive ☢️
relative atomic mass
53,00729 ± 0,00075 Da
masstal53
g-factor
Halveringstid
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum2009
Paritet-
53Ar Decay Modes
decay modeIntensitet
β− (β− decay)%
β− n (β−-delayed neutron emission)%
2n (2-neutron emission)%

54Ar

natural abundanceRadioactive ☢️
relative atomic mass
54,013484 ± 0,000859 Da
masstal54
g-factor
0
Halveringstid
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum2018
Paritet+
54Ar Decay Modes
decay modeIntensitet
β− (β− decay)%
β− n (β−-delayed neutron emission)%
2n (2-neutron emission)%
Argon ice 1

historia

upptäckare eller uppfinnareSir William Ramsey, Baron Rayleigh
fyndplatsScotland
upptäcktsdatum1894
etymologiGreek: argos (inactive).
uttalAR-gon (engelska)

Sources

Förekomst
Abundance in Earth's crust
3,5 mg/kg
Abundance in Oceans
0,45 mg/L
Abundance in Human Body
Abundance in Meteor
Abundance in Sun
0,007 %
Abundance in Universe
0,02 %

Nuclear Screening Constants

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