The least metallic element of group 1 is :-
Lithium
Sodium
Potassium
Caesium
The least metallic element of Group 1 is Lithium as metallic character decreases down the group and Lithium lies at the top of Group 1.
The metallic character of group 14 elements:
The element with least ionization energy in group 1 is Caesium.
The least metallic element among the following is: