In which set of elements would all members be expected to have very similar chemical properties?

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.

Which of the following electromagnetic waves can create ions?

What substance has a mass of 9.5g and volume of 2.1cm^3