K2O is potassium oxide. Per means one more oxygen, so
K2O2 is potassium peroxide.
Look at H2O2 for hydrogen peroxide.
H2O2 is a dimer(the empirical formula is HO) as is K2O2(the empirical formula is KO). By the way, oxygen has an oxidation state of -2 in most compounds but in peroxides it is -1.
How come the formula for potassium peroxide is K2O2; I can't see how you'd get that...
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