Consider the positions of carbon, nitrogen, potassium, and calcium on the periodic table. the atoms of which element attract electrons most strongly in chemical bonds?

Observe the periodic table and find these four elements. The strongest one will be furthest to the right, and the highest up. Note that if we have elements a and b, and a is further to the right than b but not as high up as b, a is still stronger because it comes down to who is furthest to the right AND THEN who is further upward if two options are on the same column. With that being said, Nitrogen is the answer.

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 .