calcium ,strontium and barium generally form ionic compounds because of
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calcium is present in 7 th group because of which it has +2 charge
and therefore it forms ionic compound in order to complete is orbital
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The chemistry of the alkaline-earth metals, like that of the alkali metals, is for the most part reasonably interpreted in terms of an ionic model for the compounds formed. This model is less satisfactory for the chemistry of beryllium and magnesium than for the heavier alkaline-earth metals. In fact, most beryllium compounds are molecular (covalent) rather than ionic. This is a consequence of the high charge-to-size ratio of the Be2+ ion, which strongly polarizes bonds to it.
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