Atom
Name
Argon
IUPAC name
Argon
InChI
InChI=1S/Ar
InChI key
XKRFYHLGVUSROY-UHFFFAOYSA-N
CAS number
7440-37-1
Comments
natural Ar - 99.6% 40Ar + 0.33% 36Ar
Symbol and fundamental properties
Symbol
Ar
Formula
$Ar$
Charge
0
Atomic number Z
18
Nuclear spin I
0
Molar mass
39.948 $g/mol$
State STP
gas
Electronegativity
0.0
Isotope mixture type
terrestrial abundance
Isotopes
  IUPAC Name A Mole fraction
Argon-36 36 0.003336
Argon-38 38 0.000629
Argon-40 40 0.996035
Type K L1 L2 L3 M1
Energy (keV) 3.2029 0.32 0.2473 0.2452 0.0293