Using the periodic table, choose the more reactive metal. (hint: reactivity of Ga > Al: reactivity of Zn > Ga) Pt or Ag

Based on the information provided, we are told that gallium (Ga) is more reactive than aluminum (Al) which suggests that as we go down a group in the periodic table, the reactivity increases. We are also told that zinc (Zn) is more reactive than Ga, which suggests that as we move to the left in a row in the periodic table, the reactivity increases. These pieces of information combined suggest that as we move down and to the left in the periodic table, the reactivity increases.

Therefore, when comparing reactivities of platinum (Pt) and silver (Ag), we see that Pt is exactly down one space and to the left one space from Ag, which suggests that Pt is more reactive than Ag.