How did the Spanish civil war led to ww2

Which is not true about oxygen-17 and oxygen-18?

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2