What is an example of density? pls helppp​

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.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Calculate the number of moles of ethane in 100 grams