What is a difference between A monatomic ion and a polyamotic ion?

Answer 1

A polyatomic ion is a compound made up of multiple atoms and has an overall charge. Examples of these include ammonium (NH4+) and sulfate (SO42-). Oxyanions are a specific subset of polyatomic ions and they are so named because they contain oxygen (oxy-) and have an overall negative charge (anion). Examples of oxyanions are sulfate (SO42-), phosphate (PO43-), nitrate (NO3-), and chlorate(ClO3-). They each have derivatives depending on the number of oxygen atoms they have. For example, from sulfate (SO42-), we can have sulfite (SO32-), hyposulfite (SO22-), and persulfate (SO52-) (aka peroxomonosulfate to distinguish it from peroxodisulfate, S2O82-). The importance of oxyanions is that they form acids when they are dissolved in water. For example, sulfate forms sulfuric acid, sulfite forms sulfurous acid, hyposulfite forms hyposulfurous acid, and persulfate forms persulfuric acid (peroxomonosulfuric acid).