Periodic acid Periodic acid (pronounced per-iodic PURR-eye-OH-dik, rather than PEER-ee-OD-ik as in periodic table) is the highest oxoacid of iodine, in which the iodine exists in oxidation state VII. Like all periodates it can exist in two forms: orthoperiodic acid, with the chemical formula HIO and metaperiodic acid, which has the formula HIO.

Periodic acid(pronounced per-iodicPURR-eye-OH-dik, rather thanPEER-ee-OD-ikas in periodic table) is the highestoxoacidofiodine, in which the iodine exists inoxidation stateVII. Like allperiodatesit can exist in two forms: orthoperiodic acid, with thechemical formulaHIO and metaperiodic acid, which has the formula HIO.Periodic acid was discovered byHeinrich Gustav Magnusand C. F. Ammermller in 1833.[2]