The ionic nature of the bond is most pronounced in the compound 1) CaO 2) MgO 3) BeO 4) B2O3

The ionic nature of the bond will be expressed most clearly in the compound in which the difference between the electronegativity of the elements included in its composition is maximum. The most active metal from the proposed list is calcium, therefore, in its oxide, the ionic component of the chemical bond will be expressed to the greatest extent.
Answer: CaO.



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