Why do $SrO_2$ and $BaO_2$ NOT exist?

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Answer 1 · 2016-01-31T14:46:05

In fact both strontium peroxide and barium peroxide exist.

Both peroxide salts are available in the latest Aldrich catalogue. [See here for a wiki link.](https://en.wikipedia.org/wiki/Strontium_peroxide)

And note that these peroxides are formally the salts of $M^(2+)$ , and $O_2^(2-)$ ions...

Why do SrO_2SrO_2 and BaO_2BaO_2 NOT exist?