Alkaline earth metals form hydrated crystalline solids such as . This is due to-
(A) Smaller ionic size
(B) Increased charge on ions
(C) Higher hydration enthalpies
(D) High oxidation potential
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(C). The hydration energy of the ions of alkaline earth metals () is nearly 4 or 5 times greater than that of alkali metals because of their small size and increased charge.