Which of the following has the largest atomic radius?

Question

a
Rb, Rubidium
b
K, potassium
c
Na, Sodium
d
Li, Lithium

Answer 1

The atomic radius tends to increase as you move down a group in the periodic table and decrease as you move across a period from left to right.

In the provided options, the elements are all alkali metals (group 1) arranged in order of their appearance in the periodic table:

• Li (Lithium) - Period 2
• Na (Sodium) - Period 3
• K (Potassium) - Period 4
• Rb (Rubidium) - Period 5

Since Rubidium (Rb) is the lowest in the group, it has the largest atomic radius among the elements listed.

Therefore, the answer is: a. Rb, Rubidium.