Sulphur's electron configuration is 1s2s22p63s23p4. Sulphur
has valence electron?

six valence electrons

The outer energy level in this atom is n = 3. It holds six electrons, so sulfur has six valence electrons.

Explanation:

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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 .