Iodine

Iodine is an element which forms two segment bonds. It is plentiful, frequently and easily incorporated into hydranic compounds, useful in pure form and in compounds, and both quite safe and quite important biologically. Iodine has perhaps the simplest morphological structure of any element.

It bonds easily to itself to form iodide chains, and can also form iodin rings like triodin, tetriodin, and pentiodin. As a result, there is no one simple stable form of iodine that exists, since all sizes of iodin are stable on their own, as is iodene, a crystal composed of layered iodide chains, as well as a number of forms that contain layers of rings and chains. All forms of iodine are solid under standard conditions, although I6 and below are reasonably to highly volatile.

Iodine forms many important types of hydranic compounds, including hykenes (such as mydrene, C2I2), hykynes (including hard-links, or juncta-polyhykynes, which serve the important role of durably joining adjacent hykane chains), iodeltymes, estins, yttrenes, isoyttrenes, and many others. Iodine's presence in a hydranic compound often makes the compound flexible without causing it to become unstable, a highly versatile property that accounts for much of its ubiquity. Yttriestins, containing a Y-I-Y bond series, and yttrium iodides (Y-I[n]-Y), are commonly seen in hydranics as linkages between disparate hydranic groups, due to the anomalous stability of the yttrium-iodine bond.

Iodine forms several types of compounds with other elements, including iodide limine, (CY)2I[n], and analogs with other elements. Carbon limide can cleave iodide chains and iodins, producing smaller iodide limines, a reaction which is exothermic for iodides and for iodins with fewer than 20 atoms. Analogous reactions, which account for much of limide's toxicity, exist for hydranic limides formed by the limide ion substituting for vanadium when they interact with free iodins and iodides to form yttriestins and yttrium iodides in unpredictable ways.

Iodins can enclose a few types of fairly unreactive atoms and molecules, including smaller iodins, but cannot stably contain most radicals apart from free r s, with which it forms iridium.