1% of a sample of gaseous iodine at atmospheric pressure is dissociated into iodine atoms at 575 °C. Temperatures greater than 750 °C are required for fluorine, chlorine, and bromine to dissociate to a similar extent. Most bonds to iodine are weaker than the analogous bonds to the lighter ...
Iodine and its compounds are primarily used in medicine, photography, and dyes. Iodine is rare in the solar system and Earth's crust; however, the iodides are very soluble in water and the element concentrates in seawater, where it occurs in greater concentrations than in rocks. This mechanism...
Iodine - Element, Halogen, Gas: Iodine is a nonmetallic, nearly black solid at room temperature and has a glittering crystalline appearance. The molecular lattice contains discrete diatomic molecules, which are also present in the molten and the gaseous
As a pure element, iodine is a lustrous purple-black nonmetal that is solid under standard conditions. It sublimes (changes from a solid to a gaseous state while bypassing a liquid form) easily and gives off a purple vapor. Although it is technically a non-metal, it exhibits some metallic...
Iodineis an essential trace element for animals, including humans, but is considered nonessential for plants (Brady and Weil, 1996). It is ubiquitous in the biosphere (Sheppardet al., 1994), and is capable of transferring between all three soil phases (solid, liquid and gaseous). Thus, its...
With atomic number 53 (electronic structure: [Kr]4d 10 5s 2 5p 5 ) and atomic weight 126.90, it is the heaviest halogen apart from the radioactive element astatine. Known since about 1811, iodine is named from the Greek word for 'violet-like' 鈥 a reference to the color of gaseous ...
Iodine precipitates in the cathode when iodine acetate solution is electrolyzed, which prove that iodine has positive charge. Iodine is soluble in organic solvents, and the color of solution is purple, the same as gaseous iodine. It is always a diatomic molecule in different polar solvents, such...
Physical and chemical properties.The density of iodine is 4.94 g/cm3; melting point, 113.5°C; and boiling point, 184.35°C. A molecule of liquid and gaseous iodine is composed, of tbwo atoms (I2). A high degree of dissociation (I2s⇆2l) is observed above 700°C, as well as upon...
The factors involved in the choice of an icdine ; removal system are illustrated in the problem of an in-pile testing rig under ; various fault conditions, e.g., coolant and fuel element failure. The system ; finally chosen is one with an activated carbon bed, but it is emphasized that...
Iodine has long been recognised as an important element environmentally. Despite this there are many gaps in our knowledge of its geochemistry and even where information is available much of this is based on old data which, in the light of recent data, are suspect. Iodine forms few independent...