Bond angles of atoms with lone pair electrons

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

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Silvia Huang 3D
Posts: 30
Joined: Fri Sep 25, 2015 3:00 am

Bond angles of atoms with lone pair electrons

Postby Silvia Huang 3D » Wed Oct 28, 2015 4:42 pm

Just to clarify,
Bent/ Angular (AX2E, AX2E2) has a bond angle of <120 degrees
Trigonal Pyramidal (AX3E) has a bond angle of <109.5 degrees
but a square planar(AX4E2) would have a bond angle of 90 degrees, because the lone pairs are symmetric and they cancel out??

What about Seesaw, T-shape and square planar??
Would a seesaw shape has <90 and <180 degree bond angels?? because the lone pairs have stronger repulsion force than a bond.
Or would it has bond angles of just 90 and 180 degrees?

Kim Vu 2G
Posts: 29
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond angles of atoms with lone pair electrons

Postby Kim Vu 2G » Wed Oct 28, 2015 6:17 pm

For bent, AX2E2, the bond angle is <109.5. The bond angles of seesaw would be less than 120 and 90 degrees, not 180 degrees and yes the lone pair does have a stronger repulsion than the bond pair, which is why the the angles are less than 120 and 90 degrees.


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