How does water temperature affect the rate of gas
production in Alka-Seltzer?

In the hot water the tablet should have more vigorously produced bubbles than in the cold water. The higher the temperature, the faster the molecules move—and the more likely it is that the bicarbonate will contact hydrogen in just the right way for the chemical reaction to occur and produce carbon dioxide bubbles.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.