How did the development of the earliest idea about atoms differ from the later work of scientists?

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.

V1t2 = v2t1 is an expression of who’s law

Air can be considered a mixture. which statement does not explain why?