Among the oxidation states following even-odd rule, the oxidation states which are significantly more stable than other must satisfy two requirements:Electron configuration correspond to that oxidation state is the electron configuration's noble gas.The element in compound correspond to the oxidation state must use whole electrons distributed on p-outermost subshell. Example:The more stable oxidation states of Cl are-1 (Ar); + 7 (Ne) (noble gas); and + 5 because of using whole electrons of 3 p sub shellThe more stable oxidation states of S are-2 (electron configuration of Ar), + 6 (electron configuration Ne) and + 4 because of using whole electrons of 3 p sub shell.
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