An element X of group 15 exists as a diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell. (a) Identify the element X. How many valence electrons does it have? (b) Draw the electron dot structure of the diatomic molecule of X. What type of bond is formed in it? (c) Draw the electron dot structure for ammonia and what type of bond is formed in it?

Answer:

(a) Element X is Sulphur

(b) The electronic configuration of sulphur is written as

Sulphur (Z = 16) = 1s2 2s2 2p6 3s2 3p4 = 2, 8, 6

(c) 2FeSO4(s) + Heat → Fe2O3(s) + SO2(g) + SO3(g)

(d) Sulphur oxides (SO2 and SO3) are acidic in nature.

(e) Group 16 Period 3

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