Difference between molecular shape

[Amy Luu 2G]

What is the difference between trigonal pyramidal and T-shaped? Similarly, what is the difference between seesaw and tetrahedral? I keep choosing one but the answer is actually the other.

[Mashkinadze_1D]

A trigonal planar shape has no lone pairs attached to the central atom and a T shaped has two lone pairs attached to the central atom. Similarly, a tetrahedral structure has no lone pairs attached to the central atom, while a seesaw would have one lone pair attached to the central atom. Hope this helps!

[Sanjana K - 2F]

Seesaws: 1 LP, seesaw molecular shape, trigonal bipyramidal electron arrangement, bond angles of 90 and 120 degrees
Tetrahedral: 0 LP, tetrahedral molecular shape, tetrahedral electron arrangement, bond angles of 109.5 degrees

Trigonal pyramidal: 1 LP, trigonal pyramidal molecular shape, tetrahedral electron arrangement, bond angles of 109.5 degrees
T-shape: 2 LP, T-shape molecular shape, trigonal bipyramidal electron arrangement, bond angles of 90 and 120 degrees

[Sean Cheah 1E]

I found this simple table online that might help you visualize and remember all the various molecular geometries.