How does the size of ions affect the conductivity of a solution?

Small ions have small areas. There is less resistance as they move through the solution.

For example, in molten salts, the conductivity of Li+ is greater than that of Cs+.

Small ions have high charge density.

wher is the rest of the question

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.