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Periodate (/ p ə ˈ r aɪ. ə d eɪ t / pə-RY-ə-dayt) is an anion composed of iodine and oxygen.It is one of a number of oxyanions of iodine and is the highest in the series, with iodine existing in oxidation state +7.
Magnesium iodide is an inorganic compound with the chemical formula Mg I 2. It forms various hydrates MgI 2 ·xH 2 O. Magnesium iodide is a salt of magnesium and hydrogen iodide. These salts are typical ionic halides, being highly soluble in water.
[Mg(H 2 O) 6] 2+ → [Mg(H 2 O) 5 (OH)] + + H 3 O + (decomposes in water) MgCl 2 ·nH 2 O → Mg(OH)Cl + HCl + (n-1)H 2 O (decomposes when heated) Magnesium chloride is an ionic compound, which can be electrolysed in a molten state to form magnesium and chlorine gas. The properties of magnesium bromide and magnesium iodide are similar.
The compound is stable on a temperature up to approximately 580 °C (1,076 °F). If the temperature is higher than that value, the following reaction, known as Rammelsberg 's reaction, occurs: [ 3 ] 5 Ba(IO 3 ) 2 → Ba 5 (IO 6 ) 2 + 9 O 2 + 4 I 2
Iodine dioxide is a binary inorganic compound of iodine and oxygen with the chemical formula IO 2. [1] [2] Only stable as a dilute gas, [3] this compound is one of many iodine oxides, [4] [5] and "iodine dioxide" is sometimes used to describe its formal dimer, the salt diiodine tetroxide (I 2 O 4, [IO] + [IO 3] −).
Periodic acid (/ ˌ p ɜːr aɪ ˈ ɒ d ɪ k / per-eye-OD-ik) is the highest oxoacid of iodine, in which the iodine exists in oxidation state +7. It can exist in two forms: orthoperiodic acid, with the chemical formula H 5 IO 6, and metaperiodic acid, which has the formula HIO 4.
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The compound appears to be highly unstable but can react with alkenes to give halogenated products. [ 7 ] Radical iodine oxide (IO), iodine dioxide (IO 2 ), collectively referred to as I x O y and iodine tetroxide ((I 2 O 4 ) all possess significant and interconnected atmospheric chemistry.