1。 Assign Oxidation States to Known Elements
* カリウム（k）： Group 1 metals always have an oxidation state of +1.
* 酸素（O）： Oxygen usually has an oxidation state of -2 (except in peroxides and superoxides).
2。方程式を設定します
Let the oxidation state of iodine be represented by "x". The sum of the oxidation states in a neutral compound must equal zero. したがって：
(+1) + x + 4(-2) =0
3。 x を解決します
1 + x - 8 =0
x =+7
Therefore, the oxidation state of iodine in KIO₄ is +7.
