Question

arrange the periodic families in order of metal reactivity. least ( ) ( ) ( ) ( ) most alkali metals alkaline earth metals halogens noble gases

Explanation:

Metals in group 1 (alkali metals) are more reactive than group 2 (alkaline - earth metals) as they have one valence electron and can more easily lose it to form a positive ion. Halogens are non - metals and noble gases are very stable with full outer shells, so they are not considered in metal reactivity.

Answer:

1. Least: Alkaline Earth Metals
2. Most: Alkali Metals