Question

what is a polyatomic ion?
an ion made of two atoms of the same element
an ion made of many atoms bonded together
an ion that can change its charge
an ion that only bonds with nonmetals

Explanation:

A polyatomic ion is defined as an ion composed of multiple atoms that are chemically bonded together. The first option is incorrect as it refers to a diatomic (two - atom) ion of the same element, not polyatomic. The third option about changing charge is not the defining characteristic. The fourth option about bonding only with nonmetals is also not the key definition. The second option correctly describes a polyatomic ion as being made of many atoms bonded together.

Answer:

An ion made of many atoms bonded together