Bond Angles in Square Pyramidal and T-Shaped

[Reina Robles 2B]

Hi, I'm a little confused.

Are all the bond angles in square pyramidal (AX5E) 90 degrees? What about the bond angle between the two equatorial atoms? And doesn't the lone pair also affect the angle?

And with t-shaped (AX3E2, AX3E3), are the bond angles 120 and 90 degrees even though there are lone pairs?

Thanks!

[Kavya Immadi 3D]

The bond angles in a square pyramidal are slightly less than 90 degrees because of the extra repulsion of the lone pair. The electron geometry is a octahedral so all the bond angles are the same (the term equatorial atom is used for trigonal bipyramidal). For T-shape, the bond angles will always be slightly less than 90 degrees.

[Alfred Barrion 2H]

In a square pyramidal all angles are <90 degrees
In a t-shape the angles are <90 degrees

[sarahsalama2E]

I thought T-shaped had more than one bond angle does it not?

[KnarGeghamyan1B]

T shaped has a less than 90 degree angle for all of the angles between the bonds that form the actual T, but the 2 lone pairs at the top that repel each other are what forms the 120 degree angle with the bottom atom of the T.