I3- ion shape

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Jane Burgan 1C
Posts: 73
Joined: Fri Sep 28, 2018 12:15 am

I3- ion shape

Postby Jane Burgan 1C » Thu Nov 22, 2018 2:41 pm

Why is the shape of an i3- ion linear not angular? Don't the two lone pairs on top of the central iodine repel the other two iodine atoms from being attached in a straight line to the central iodine to bent?

Lauren Ho 2E
Posts: 70
Joined: Tue Oct 09, 2018 12:16 am

Re: I3- ion shape

Postby Lauren Ho 2E » Thu Nov 22, 2018 3:15 pm

I3- ions have three lone pairs around the central I atom, meaning the molecule as a whole has an electron geometry of trigonal bipyramidal and a linear molecular geometry.
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Ava Kjos 1D
Posts: 65
Joined: Fri Sep 28, 2018 12:19 am

Re: I3- ion shape

Postby Ava Kjos 1D » Fri Nov 23, 2018 12:35 pm

It's easier to understand why it's linear if you imagine a bipyramidal structure. Since there are three lone pairs in the I3- ion, imagine that the three central atoms of the bipyramidal structure are removed, leaving only the top, middle, and bottom atoms in a linear formation.

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