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

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Ziyan Wang 3J
Posts: 51
Joined: Wed Sep 18, 2019 12:22 am


Postby Ziyan Wang 3J » Thu Nov 14, 2019 2:45 pm

Why is the shape of IF4 - is square planar, instead of octahedral?

Posts: 99
Joined: Fri Aug 09, 2019 12:17 am

Re: 2E.11

Postby 805307623 » Thu Nov 14, 2019 2:49 pm

IF4 is square planar because I(the central atom) is bonded to only 4 outside atoms. Its lone pairs do not count when it comes to its shape. An octahedral shape would suggest that the central atom is bound to 6 outside atoms.

Haley Chun 4H
Posts: 54
Joined: Sat Aug 17, 2019 12:18 am

Re: 2E.11

Postby Haley Chun 4H » Thu Nov 14, 2019 2:52 pm

in IF4, the central atom only has 4 bonding regions (square planar). With an octahedral, the central atom has 6 bonding regions.

Mallika Chimpiri 3K
Posts: 58
Joined: Thu Jul 25, 2019 12:17 am

Re: 2E.11

Postby Mallika Chimpiri 3K » Thu Nov 14, 2019 2:54 pm

This is because although IF4- has 6 areas of electron density, you only look at bonded electrons when determining molecular shape. It has 4 bonds with 2 lone pairs, which gives it an octahedral electron arrangement but a square planar molecular geometry.

Baoying Li 1B
Posts: 113
Joined: Sat Aug 17, 2019 12:18 am

Re: 2E.11

Postby Baoying Li 1B » Thu Nov 14, 2019 2:57 pm

Because when you draw the Lewis Structure, there are two lone pairs on top of Iodine. These two lone pairs make the original structure(tetrahedral) bend to a square planar structure. The arrangement is octahedral. It doesn't mean that the structure is the same as well.

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