The answer is 4 million, there are about 9-10 million unique organic compounds that are known to exist
Answer:
Iron Oxide (Fe2O3) also known as rust is also an ionic bond, it has metallic compound Iron (Fe) which contains positively charged cations and it has nonmetallic compound Oxygen (O) which contains negatively charged anions.
Explanation:
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I think its<em> A) </em><u>Nonmetals in the upper right </u>