None
Oxygen is oxygen, so to speak.
It is an element itself, so is not a compound made of other elements.
Carbon and oxygen.....
phosphorus and oxygen
iron & oxygen
Nitrogen and oxygen
Hydrogen, Oxygen and Carbon
Carbon and oxygen.....
Carbon, hydrogen and oxygen are the only elements that make up sugars.
solid liquid gas
The elements that make up a lead nitrate are lead nitrogen and oxygen
phosphorus and oxygen
calcium and oxygen
iron & oxygen
The four elements that make up most of living matter are hydrogen, oxygen, carbon and nitrogen.
Iron and oxygen
Two or more elements make up a compound, and oxygen has one.
Iron and oxygen
hydrogen and oxygen, cH4