Question

Which cation has smallest radius​

Answer 1

Explanation:

As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

Answer 2

Answer:

Explanation:

Li and Be belongs to second period while Na belongs to third and K potassium belongs to fourth period. So Li and Be are smaller in size.

Among Li⁺  and Be²⁺  ; Be²⁺  is smaller in size due to high effective nuclear charge.