3(iii)
Element A belongs to group 15 and period 2 of the Periodic Table.
(a) Identify the element A.
(b) Write the formula of the compound formed when element A combines with hydrogen.
(c) Draw the dot (•) and cross (×) structure of the compound formed in (b) above.
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(a) Element A is Nitrogen (N) with electronic configuration 2, 5.
(b) Nitrogen has a valency of 3 and combines with hydrogen (valency 1) to form ammonia (NH3).
(c) Dot (•) and cross (×) structure of NH3:
