Peroxides of the Group Two Elements of the Periodic Table

All elements of the second group, with the exception of beryllium [1], form peroxide compounds. Peroxides of calcium, strontium, and barium belong to the M2+O2 2- type; while peroxides of magnesium, zinc, and cadmium, of general formula MO2 • xH2O, probably belong to the HO—M—OOH type where the covalent bond between the hydroperoxyl group and the metal atom is the same as that in the hydrogen peroxide molecule [2–4]. Radium peroxide, RaO2, the heat of formation of which is estimated as 150 kcal/mole [5], has not yet been produced.

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