Question

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

Explanation:

Metallic character increases down a group in the periodic table. Among the given elements (Na, K, Li, Rb, Cs) which are all in Group 1 (alkali metals), Li is the highest up in the group. As we move down the group (from Li to Cs), the atomic size increases, and the ability to lose electrons (a property related to metallic character) also increases. So, Li has the least metallic character among them.

Answer:

Li