If CO is carbon monooxide CO2 is carbon dioxide Then why CO3 is carbonate not carbontrioxide?

If CO is carbon monooxide CO2 is carbon dioxide Then why CO3 is carbon

1.	If CO is carbon monooxide CO2 is carbon dioxide Then why CO3 is carbonate not carbontrioxide?
Answer» The salt of carbonic acids are called carbonates and are characterized by the carbonate ion, CO32-. The carbonate ion is the simplest oxocarbon anion, consisting of one carbon atom surrounded by three oxygen atoms in a trigonal planar arrangement.