Question

what is the difference between shape and geometry of a molecule in chemistry? ​

Answer 1

SHAPE refers to the three-dimensional structure with lone pair electrons included (all the orbitals). For example, the GEOMETRY of water is bent (because the electrons don't count for the GEOMETRY) and the SHAPE is tetrahedral (electron lone pairs are included). ... "Geometry" is the study and measurement of shapes.

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Answer 2

SHAPE refers to the three-dimensional structure with lone pair electrons included (all the orbitals). For example, the GEOMETRY of water is bent (because the electrons don't count for the GEOMETRY) and the SHAPE is tetrahedral (electron lone pairs are included). ... "Geometry" is the study and measurement of shapes.Geometry of a molecule is the arrangement of lone pair + bond pair around the central atom and corresponds to the coordination number of the molecule while shape is the molecule structure excluding the lone pair on the central atom. Shape does not count lone pair.

For example : Methane CH4 , Ammonia NH3 and H2O all have CN=4 and have tetrahedral geometry but all of them have different shapes. Since there is no lone pair on carbon in methane it's geometry and shape is equivalent but NH3 has pyramidal shape and Water molecule has Bent or V shape.

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