Where do the elements heavier than hydrogen and helium come from?

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.

Name the element in group 17, period 2. (periodic table)

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins