Answer:
In alkaline earth metal salts, the
size of the metal ion is smaller and nuclear charge is higher as compared to
the corresponding alkali metal ion present in the same period. Therefore,
alkaline earth metal ions have a greater tendency to get hydrated and form
crystalline salts whereas this tendency is negligible in alkali metal salts.
For example, magnesium chloride\[(MgC{{l}_{2}})\] exists as\[MgC{{l}_{2}}.6{{H}_{2}}O\]while
sodium chloride (NaCI) is completely anhydrous.
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