Question

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

Answer 1

Explanation:

Both the melting and boiling points decrease down the group. When any of the Group 1 metals is melted, the metallic bond is weakened enough for the atoms to move more freely, and is broken completely when the boiling point is reached

Answer 2

I.E that is ionisation enthalpy due to increase in radius.