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.
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