The shape of the molecule I3- is Linear. There are three Iodine atoms out of which one has an extra negative charge. As there are three lone pairs on the central Iodide atom, these pairs try to repel each other as much as possible.
So in order to be away at a greater distance, the pairs take the equatorial positions, and the other two Iodine atoms are degrees from one another. Thus the overall shape of the I3- ion is linear. So here is the tricky part about this ion, first of all like it as a charge on it we can call it as a polyatomic ion instead of calling it a molecule. Ions are the charges we see on the molecules.
As I3- has one electron, this Ion has a negative charge overall. Molecules have polarity because it has both the charges that are a partially positively charged end and the partially negatively charged end.
There is a dipole moment on the molecules depending upon the separation of the charges on the molecule. If the distance between both the charges is larger the dipole moment will also be larger. But when we talk about I3- ion it is a negatively charged ion. So it is neither polar or nonpolar. In concluding remarks, to sum up, this entire article, I3- is a polyatomic ion that has 22 valence electrons, 3 lone pairs, 2 bond pairs, and sp3d hybridization.
It is linear in shape and has no polarity. Therefore, it makes the shape of the I3- ion symmetrical and linear. You can calculate the mass of the molecules depending on the weight of the element. In this case, the atomic weight of iodine is Therefore, the molar mass of i3- is One atom of the three is negatively charged, and this also gives two bond pairs and 3 lone pairs of valence electrons, making the molecular geometry linear.
All the values of the I3 ion are negative as it only has one electron. If a molecule has a partially positively charged end and a partially negatively charged end, then it will have polar bonds, but this is not the case for I3-, therefore, it is not polar or nonpolar. The bond angle of I3- was formed when the two other iodine molecules bonded with I- ion. The value of this is degrees celsius. Since the three molecules have seven electrons that are non-bonding, the other two iodine atoms formed the bond instead.
The shape of I3- ion is linear and also symmetrical. The iodine molecules bonded axially in a linear fashion. There are two atoms sharing valence electrons out of three lone pairs in this molecule, and based on the VSEPR theory, I3- has three equatorial lone pairs which have also bonded to the central iodine atom. When drawing Lewis Structures, we first count the valence electrons with the use of the periodic table.
In the periodic table, iodine is the seventh group with the atomic number 53, and it has seven electron valence. We must follow the Octet rule, so it will be the Central Atom sharing electrons to neighbouring Iodine atoms from its eight electrons in its outermost shell, leaving six electrons that will form the non-bonding lone pairs.
The last thing to make sure is that all molecules maintain the lowest possible formal charge. I3- is not bent because it is in a different electronic environment. The nonmolecular interactions with surrounding ions ir dipole thus tend to break up the trihalide ions. With iodine the single atom is still a bit bulky and therefore the nonmolecular interactions have little power to break up the triiodide complex. With smaller-atom halogens the nonmolecular interactions become stronger and more important.
What is the lightest known trihalide ion, then, given the fact of these evil nonmolecular electrostatic interactions? The answer may surprise a few people. This ion is actually fairly commonplace if you know where to look, which could be an organic chem lab. We therefore move on to a bigger, or smaller, challenge:. Trichloride ion is also obtained as an ionic liquid by adding chlorine to an ordinary chloride salt.
The reference given here includes a list of trichloride ion bearing materials, both solid and liquid. Surely we have reached our wit's end? This reference reported that trifluoride ion has been observed in a low-temperature noble gas matrix and at low pressure in the gas phase. The same reference also reports that the main contributing structures for this ion involves radical combinations rather than the ion-molecule model we might ordinarily expect for this type of complex.
Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How is the structure of triiodide ion I3- possible? Ask Question. Asked 3 years, 2 months ago.
Active 2 years, 1 month ago. Viewed 14k times. Improve this question. Gaurang Tandon 8, 10 10 gold badges 55 55 silver badges bronze badges. See e. I don't mean to say your question is wrong. It's still valid to ask "what drives the formation of I3 - from I2 and I-?
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