What is the final temperature of the metal? What is the temperature change of the water?
What is the temperature change of the metal?
"C

So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.

Um ask a different problem if you want me to answer