Chemical element
Oxygen
- O
- Z = 8
- nonmetal
Oxygen (O) is element 8, a nonmetal in period 2 and group 16. Its standard atomic weight is 15.999 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolO
Standard atomic weight15.999atomic mass units (Da)
Mass in kilograms2.6566965 × 10^-26
Categorynonmetal
Group16
Period2
Blockp-block
Electrons in a neutral atom8
Neutrons in the most common isotope8≈
Quantities
Molar mass15.999 g/mol
Mass of one mole15.999 grams
Atoms in one gram3.7640732 × 10^22
Mass of one atom2.6566965 × 10^-23 g
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