Lewis Structure for I3-

(Polar molecules, Non-polar molecules, etc.)

Moderators: Chem_Mod, Chem_Admin

Melody Zhang 3L
Posts: 35
Joined: Fri Sep 28, 2018 12:21 am

Lewis Structure for I3-

Postby Melody Zhang 3L » Mon Dec 03, 2018 11:59 pm

Iodine has 7 valence electrons, so at first, I allocated 3 lone pairs around each of the Iodines, with the central iodine having a formal charge of -1. However, I realized that I was taught to place the negative charge on the outside atoms whenever possible, so I made one of the lone pairs of the central iodine atom into a double bond, so that the formal charge was -1 on one of the outside atoms. This changed the shape of the molecule to be bent instead of linear. The actual molecule was the structure that I originally thought, and is linear. Can someone explain why?

Posts: 82
Joined: Fri Sep 28, 2018 12:29 am

Re: Lewis Structure for I3-

Postby Jeremy_Guiman2E » Tue Dec 04, 2018 12:13 am

This seems to be the correct electron dot diagram:


The outer I's have a formal charge of 0, and I believe the formal charge of -1 is ok on the central I atom because of the fact that I3- is a negatively charged molecule, with an overall charge of -1.

Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 3 guests