An element X of group 15 exists as diatomic molecule

Question:

An element X of group 15 exists as 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. What type of bonds is formed in it ?

Solution:

(a) The available information suggests that the element X is nitrogen (N) and exists in diatomic form as N,

Electronic configuration of N(Z = 7) ; 2, 5. It has five valence electrons.

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