Yes, it is true that larger ions have lower conductivity.
Conductivity is referred to the movements of ions from one place to another. It involves the movement through crystal lattice of a solid or aqueous solution.
The smaller the ionic radius of the ion is, the lower the conductivity will be. If they are elements from the same group, they will have the same charge, but different charge densities based on their size.
The smaller ion will have a higher charge density and attract more polar water molecules if it’s in an electrolyte solution. Therefore, it becomes heavier and weaker at conducting because the ions can’t move as fast as an ion without as many water molecules attached
Thus, larger ions have lower conductivity compared to smaller ions.
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