(A) According to Fajan's rule,the smaller the size of the cation,the greater its polarizing power and the higher the covalent character of the compoun

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(A) According to Fajan's rule,the smaller the size of the cation,the greater its polarizing power and the higher the covalent character of the compound.Among the alkaline earth metals,$Be^{2+}$ has the smallest ionic radius.Therefore,$Be$ compounds exhibit the highest covalent character.