Atom
Name
Oxygen
IUPAC name
Oxygen
InChI
InChI=1S/O
InChI key
QVGXLLKOCUKJST-UHFFFAOYSA-N
CAS number
17778-80-2
Comments
natural O - 99.76% 16O + 0.2% 18O + 0.04% 17O
Symbol and fundamental properties
Symbol
O
Formula
$O$
Charge
0
Atomic number Z
8
Molar mass
15.9994 $g/mol$
State STP
gas
Electronegativity
3.44
Isotope mixture type
terrestrial abundance
Isotopes
  IUPAC Name A Mole fraction
Oxygen-16 16 0.99757
Oxygen-17 17 0.00038
Oxygen-18 18 0.00205
Type K L1 L2 L3
Energy (keV) 0.532 0.0237 0.0071 0.0071