Question

generalising vsepr shapes
identify the type of geometry (shape) for molecules based on what is coming off the central atom - look at the data you took in the first part of the assignment to complete this table

atoms bonded to central atom	lone pairs on central atom	geometry (shape)
2	1 or 2
3	0
3	1
4	0

Explanation:

The molecular shapes are determined using VSEPR theory, which relates the number of bonded atoms and lone pairs on the central atom to the molecular geometry.

1. 2 bonded atoms, 0 lone pairs: Linear geometry (no lone pair repulsion, atoms align straight).
2. 2 bonded atoms, 1 or 2 lone pairs: Bent geometry (lone pair repulsion pushes bonded atoms closer, creating a bent shape).
3. 3 bonded atoms, 0 lone pairs: Trigonal planar geometry (atoms arrange evenly in a flat triangle around the central atom).
4. 3 bonded atoms, 1 lone pair: Trigonal pyramidal geometry (lone pair repulsion pushes the three bonded atoms down into a pyramid shape).
5. 4 bonded atoms, 0 lone pairs: Tetrahedral geometry (four bonded atoms arrange in a 3-sided pyramid shape around the central atom).

Answer:

Atoms bonded to central atom	Lone Pairs on central atom	Geometry (Shape)
2	1 or 2	Bent
3	0	Trigonal Planar
3	1	Trigonal Pyramidal
4	0	Tetrahedral