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$\begingroup$ Is possible that names like perchlorate are abbreviations from former super- to per- ? Just thinking... $\endgroup$
– Poutnik
Commented Aug 19, 2019 at 7:15
$\begingroup$ On 3, "feel free to edit". If <2000 rep, I would accept such an edit. On 2, potassium peroxide is stable but covered in the answer under "alkali metal cations". $\endgroup$
– Oscar Lanzi
Commented Aug 19, 2019 at 14:40

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