The electronic configuration of an element 'X' is 2, 8, 8, 2. To which period and group of the periodic table does the element 'X' belong ? State its valency. Justify your answer in each case.

Explanation

Since the element 'X' has four electrons shells, it is placed in the fourth period. As the element has two valence electrons, it belongs to group two. The element also shows a valency of two in its compounds.