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Iodine Sublimed ACS Reagent
  • 25g Iodine Sublimed ACS Reagent

  • $ 0.00891000
  • 125g Iodine Sublimed ACS Reagent

  • $ 0.00000000
  • 500g Iodine Sublimed ACS Reagent

  • $ 0.00000000
  • 2.5kg Iodine Sublimed ACS Reagent

  • $ 0.00000000
  • 12kg Iodine Sublimed ACS Reagent

  • $ 0.00000000
  • 50kg Iodine Sublimed ACS Reagent

  • $ 0.00000000

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Iodine is a chemical element with symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Though it is the least reactive of the halogens, iodine is still one of the more reactive elements. For example, while chlorine gas will halogenate carbon monoxide, nitrogen monoxide, and sulfur dioxide to phosgene, nitrosyl chloride, and sulfuryl chloride respectively, iodine will not do so. Furthermore, iodination of metals tends to result in lower oxidation states than chlorination or bromination; for example, rhenium metal reacts with chlorine to form rhenium hexachloride, but with bromine it only forms rhenium pentabromide and iodine can achieve only rhenium tetraiodide. By the same token, however, since iodine has the lowest ionisation energy among the halogens and is the most easily oxidised of them, it has a more significant cationic chemistry and its higher oxidation states are rather more stable than those of bromine and chlorine, for example in iodine heptafluoride. Iodine is an essential constituent of thyroid hormones and is essential for normal growth and development. Iodine deficiency causes goiter and hypothyroidism in children and adults, and cretinism if present during fetal development. Iodine deficiency is the most common cause of preventable mental defects in the world today. Cretinism and goiter are completely preventable by iodine supplementation. Iodine toxicity is rare, but high dietary intake may be responsible for iodine induced hyperthyroidism. Iodine intake has not been linked to liver injury.

Molar mass
253.809 g/mol
CAS Number
4.933 g/cm?
ACS Reagent
Melting point
386.85 K ?(113.7 °C. ?236.66 °F)
Boiling point
457.4 K ?(184.3 °C. ?363.7 °F)
Solubility in water
0.034 g/kg at 25 deg C
Refractive index (nD)

Note: The chemical specifications for some items on this product page may differ from the specifications listed above. For more information, consult with our manager. A detailed specification for any chemical product is available on request.

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