Iodine crystals and vapour
Numéro d’image : 11519810
| Iodine. Crystals of the element iodine (chemical symbol: I) heated to produce iodine vapour. Iodine is a violet-black non-metallic element which gives off a violet vapour. With a melting point of 113. 5 degrees centigrade,it belongs to the halogen group of elements on the periodic table. Iodine is found in seawater and was formerly extracted from seaweed; it is now obtained from oil-well brines. Iodine is required as a trace element by most living organisms. In mammals it is concentrated in the thyroid gland as a constituent of thyroid hormones. Iodine was discovered by Courtois in 1812 | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Nuridsany, Claude / Perennou, Maria |
| Taille de l’image : | 3375 px × 4818 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
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