I and O Ir and O Fe and O Pb and O
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Iron oxides, such as rust, form when iron metal reacts with oxygen in the air. What are the chemical symbols for the two elements found in iron oxide?
Possibilities:
- I and O
- Ir and O
- Fe and O
- Pb and O

Fe and O