What is true of atoms? A They can be found in light.
B. They are too small to see.

C. They have electrons that do not move.

D. They are the same for all elements.

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .