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Diphosphorus trioxide is a covalent compound.
Covalent
Covalent
Covalent
Covalent
Covalent
P2O3 is diphosphorus trioxide and P2O5 is diphosphorus pentoxide
Dinitrogen trioxide is covalently bonded.
Phosphorous Oxide
SO3 is a covalent compound, not ionic. It is called sulfur trioxide.
Acidic
It is a molecular (covalent) compound. Present day text books refer to a covalent compound as a molecular compound, as opposed to an ionic one.