Question

which of the following atoms has the least metallic character? rb k cs na li

Explanation:

Metallic character increases down a group in the periodic table. Among the given elements (Li, Na, K, Rb, Cs) which are all in Group 1 (alkali metals), as we move from Li (atomic number 3) at the top of the group to Cs (atomic number 55) at the lower - part of the group, the metallic character increases. So the element with the least metallic character is the one at the top of the group.

Answer:

Li