Q. Assertion (A) The heaviest element in each -block group is most metallic in nature.
Reason (R) The non-metallic character decreases down the group.

 464  146 The p-Block Elements Report Error

Solution:

The heaviest element in each -block group is the most metallic in nature as the non-metallic character decreases down the group.
Thus, both and are correct and is the correct explanation of .