The iron oxide is no longer a pure metal, it is a dull ... They represent the number of atoms of each element in the formula. For example, CO₂ contains one carbon atom and two oxygen atoms.

What are Metal Oxide Nanoparticles? Metal oxide nanoparticles are a class of nanomaterials composed of metal cations bonded to oxygen anions, with particle sizes ranging from 1 to 100 nanometers.