If Trioxide refers to Ozonide ion, the formula is O3-
CO3
N2o3
You don't say that. What you do say is that the valency of sulphur in sulphur trioxide is 6.
2 sulfur 3 oxygen S2O3
trisulfur septoxide
A sulfone contain the structure S(=O)2-R' where R' is an organic group.
SO3 is the chemical formula for sulfur trioxide.
Formula of dinitrogen trioxide is N2O3
Xenon Trioxide
Arsenic trioxide refers to Diarsenic trioxide = As2O3 . It is not to be confused as AsO3 which does not exists.
The chemical with the formula N2O3 is called Dinitrogen trioxide.
Formula: TeO3
Formula: Mn2O3
B2O3 is the formula
Formula: Si2O3
Formula: SO3
The chemical compound sulfur trioxide is known - SO3.
Formula: N2O3