question_answer

\[M{{g}^{2+}}\] ion is more highly hydrated than \[N{{a}^{+}}\] ion.

Answer:

                The positive charge density around \[M{{g}^{2+}}\] ion is more than around \[N{{a}^{+}}\] ion due to its smaller size and more number of positive charges. Therefore, \[M{{g}^{2+}}\] ion has a greater tendency to attract surrounding \[{{H}_{2}}O\]  molecules from water than \[N{{a}^{+}}\]ion. In other words, it is more highly hydrated than \[N{{a}^{+}}\] ion.