Iron (Fe)
The final stage of metal refining is typically electrolysis.
Oxygen is a non-metal. (Oxides are compounds of oxygen)
Phosphorus is not an oxide. It is an element. It is a nonmetal.
metal oxide plus water makes a base example: NaO + H2O ==> 2 NaOH nonmetal oxide plus water makes an acid example: CO2 + H2O ==> H2CO3