What is the symbol for hydroxide?
Hydroxide
Ortho-periodic acid[note 6] can lose all its protons, eventually forming the periodate ion [IO4]−. It can also be protonated in strongly acidic conditions to give the octahedral ion [I(OH)6]+, completing the isoelectronic series, [E(OH)6]z, E = Sn, Sb, Te, I; z = −2, −1, 0, +1. Other acids of iodine(VII) that contain hydroxide groups are known, in particular in salts such as the meso</i>periodate ion that occurs in K4[I2O8(OH)2]·8H2O.[30]