Original: It can refer to two different chemical compounds , sodium metaperiodate ( often abbreviated as m-periodate ) , which has the formula NaIO4 , and sodium orthoperiodate ( often abbreviated as o-periodate ) , which has the formula Na5IO6 .
Simplified: Its chemical formula can be NaIO4 ( sodium metaperiodate ) or Na5IO6 ( sodium orthoiodate ) .