Question

Which physical property of the alkali metal group decreases down the group​

Answer 1

Melting and boiling point

Step-by-step explanation:

For all group 1 elements, the melting and boiling point of the various members of the group decreases down the group. Hence, as the elements become heavier, they tend to have lower melting and boiling points.

Thus in moving from lithium to francium, there is a steady decrease in the melting and boiling points of elements down the group.