Which substance is a compund a.) li b.) n2 c.) h2 d.) co2atoms of what two elemts are in a every organic compound  a.) calicum and heliumb.) carbon and oxygenc.) cobalt and hydrogen   d.) carbon and hydrogen

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.

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)? a. 5.0 × 103 b. 5.0 × 10-3 c. 5.0 × 1017 d. 5.0 × 10-17

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