Question

is ionic mobility of mg2+ greater than be2+​

Answer 1

Answer:

Yes ionoc mobility of Mg 2+ is greater than Be2+

Answer 2

Be and Mg belong to the same group of the modern periodic table, i.e., group 2.

The elements in group 2 are as follows

Be Mg Ca Sr Ba Ra (Down the group)

By the periodic properties, the radius of the elements down the group increases due to an increase in the number of shells down the group. This is valid in the case of group 2 also.

So the radius will increase on moving from Be to Mg.

On losing two electrons, Be will form Be²⁺ and similarly, Mg will form Mg²⁺

The ionic radius will also be similar in non-polar solvents since there is no attraction between these ions and the solvent.

So, ionic radius in the non-polar medium increases from Be²⁺ to Ra²⁺

In polar solvent, there is an attraction between the ions and the polar solvent molecules. The ion which has the smallest size will attract the maximum number of solvent molecules.

So, the ionic radius in the polar solvent will be greatest for Be²⁺ and least for Ra²⁺.

If the size is large, the ionic mobility will be less as the bulky ions find it difficult to move.

So ionic mobility has an inverse relation with size.

Since the size of Be²⁺ will be larger than Mg²⁺, the ionic mobility of Mg²⁺ will be greater than Be²⁺.