1. Discuss and explain along with diagram: reactivity of group 1 and 2 elements as we go down the group.

Explanation:

The electron shells between the outer electrons and the nucleus have a 'shielding' effect which reduces the attraction of the outer electrons to the nucleus. The elements on the left side of the table (i.e. group 1 and 2): These react by losing electrons and reactivity increases as you go down the group.