Periodic table of the elements
ChlorineArgonPotassium
18
Ar
Argon
39.948
2
8
8
18
Ar
Argon
39.948
2
8
8
General
NameArgon
SymbolAr
Number18
Chemical seriesNoble gases
Group / Period18 / 3
Blockp-block
CAS registry number7440–37–1

Physical properties
Stategas
Density1.784 g/L
Melting point83.80 K (-189.35°C, -308.83°F)
Boiling point87.30 K (-185.85°C, -302.53°F)
Critical point150.87 K, 4.898 MPa

Atomic properties
Atomic Weight39.948 g/mol
Crystal structurecubic face centered
Electronegativity
Atomic radius71 pm
Atomic radius (calculated)71 pm
Electron configuration[Ne] 3s2 3p6
Electrons per shell2, 8, 8
Number of protons18
Number of neutrons22

Other languages
SpanishArgón
PortugueseÁrgon
FrenchArgon
GermanArgon
ItalianArgon
RussianАргон
PolishArgon
Chinese
Arabicأرغون
TurkishArgon
DutchArgon


Periodic table of the elements
ChlorineArgonPotassium