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My study material mentions that BaO2 has both covalent and ionic bonds, but doesn't provide any explanation regarding this.

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    $\begingroup$ Review the guide How to ask and Asking FAQs to prevent clarification requests, objections, downvoting or closure. $\endgroup$
    – Poutnik
    Apr 1 at 5:34
  • $\begingroup$ It is what we call "ionic peroxide". $\endgroup$ Apr 1 at 13:17

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$\ce{BaO2}$ or Barium Peroxide consists of $\ce{Ba^2+}$ cation and $\ce{O2^2-}$ anion (or peroxide anion)

The ionic bond exists between the ions ($\ce{Ba^2+}$ and $\ce{O2^2-}$)
Whereas the covalent bond exists within the peroxide ion itself

You might want to visit this site and understand the lattice.

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    $\begingroup$ In a crystalline lattice it is not a good picture that ionic "bonds" occur between pairs of atoms - each ion interacts with every single other atom in the whole of the lattice, and A bonds to B picture is just not appropriate. Hence I suggest you at least drop the picture from the answer above. $\endgroup$
    – Ian Bush
    Apr 1 at 7:27
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    $\begingroup$ I agree with you @IanBush, but the OP mentions about the structure of $\ce{BaO2}$ alone and I thought that a formula unit would suffice to answer his question. I will do as u mentioned $\endgroup$
    – DarkKnight
    Apr 1 at 7:33

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