Bond Angles

[AlyssaBei_1F]

When determining bond angles, will a linear structure always have 180 degrees? Will a trigonal planar structure always have 120 degrees? Will a tetrahedral structure always have 109.5 degrees?

[Kim Tran 1J]

Linear structures will always be 180 degrees. But trigonal planar can be 120 degrees or if it is trigonal planar bent then it will be less than 120 degrees. Tetrahedral is 109.5 degrees but if bent or trigonal pyramidal then it will be less than 109.5 degrees. So if the molecular geometry is not linear then there is a possibility of a different bond angle.

[Rylee Nelsen 3A]

Yes, the angles depend on the structure of the molecule so for example Trigonal Planar has 0 lone pairs and is 120 degrees, Tetrahedral also has zero lone pairs and is 109.5 degrees and a T - shape has 2 lone pairs and is 90 degrees. Hope this helps!

[705088777]

If there are lone pair electrons it will make the degrees slight less than the usual value.

[Tyler Vu 4I]

The values of the angles will be close to the ones you mentioned, but lone pair electrons and electron repulsion can change them slightly.