Why might the pattern of reactivity between the alkali metals be useful to scientists?

To show trends based on the  number of electrons around the atom. In this case, having one extra election makes them prone to donating and thus  getting rid of the election to reach stability

Explanation:

this has been asked like 4 times

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )