What is "periodic acid"

n. (context inorganic compound English) HIO₄, the oxyacid of iodine in which iodine has the highest oxidation number; it is a white crystalline substance, and a strong oxidizing agent

n. any oxygen-containing acid of iodine

Periodic acid (pronounced per-iodic , rather than 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 was discovered by Heinrich Gustav Magnus and C. F. Ammermüller in 1833.