Four examples of polyatomic ions
1. Nitrate ion (NO3-) - This ion consists of one nitrogen atom bonded to three oxygen atoms. It is commonly found in fertilizers and is also present in many explosives.
2. Sulfate ion (SO42-) - This ion contains one sulfur atom bonded to four oxygen atoms. It is frequently found in minerals such as gypsum and is also a component of acid rain.
3. Carbonate ion (CO32-) - This ion comprises one carbon atom bonded to three oxygen atoms. It is present in compounds like calcium carbonate (found in limestone and marble) and sodium carbonate (used in laundry detergents).
4. Ammonium ion (NH4+) - This ion consists of one nitrogen atom bonded to four hydrogen atoms. It is commonly found in compounds like ammonium nitrate (used as a fertilizer and explosive) and ammonium chloride (used in dry cell batteries).