I’m bored ..."..
. ok,
*=

Which statements describe polyatomic ions? check all that apply. polyatomic ions have many charges. polyatomic ions have one overall charge. polyatomic ions repel other ions to form ionic bonds. polyatomic ions attract other ions to form ionic bonds. polyatomic ions are made up of only one type of atom. polyatomic ions are made up of two or more types of atoms.

The answer for #3 is c but i don't know why

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .