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explain the difference between groups and periods in the periodic table of elements

Groups contain more than 1 and a period doesn't last long unlike a group where it last for a quite some time

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 .

d. temperate deciduous forest