Question

Element A belongs to group 15 and period 2 of the Periodic Table.

1. Identify the element A.
2. Write the formula of the compound formed when element A combines with hydrogen.
3. Draw the dot (•) and cross (x) structure of the compound formed in (b) above.

Answer 1

(a) Element in Group 15 and Period 2 is Nitrogen (N).

(b) Nitrogen combines with hydrogen to form ammonia (NH₃).

(c) Nitrogen shares three of its five valence electrons with three Hydrogen atoms, leaving one lone pair (unshared pair) of electrons.