Here is a great explanation of A Chemical Compound in with good examples
Iron compounds - Wikipedia
Question Video: Deducing the Ionic Formula of an Ionic Compound Where Both Ions Have Greater-Than-One Charge | Nagwa
Recent Advances in Iron Catalyzed Oxidation Reactions of Organic Compounds - Bauer - 2017 - Israel Journal of Chemistry - Wiley Online Library
Iron nanoparticles as a promising compound for food fortification in iron deficiency anemia: a review | SpringerLink
Compound Interest on Twitter: "@RoySocChem Second was iron: responsible for the colour of Mars and Earth's magnetic field, as well as having a vital role in our blood: https://t.co/YZkgq1kQzR #IYPT2019 https://t.co/3aFGNo8IYw" /