3rd October 2019


What is a molecular shape?

Electron domain geometries refer to the five molecular shapes: linear, trigonal planar, tetrahedral, trigonal bipyramidal, or octahedral. However, if one or more of the bonding pairs of electrons is replaced with a lone pair, the shape of the molecule is altered.

Considering this, what is the shape of the molecule?

Using the VSEPR theory, the electron bond pairs and lone pairs on the center atom will help us predict the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize attraction.

What is the difference between the shape and geometry of molecules?

"Geometry" is the study and measurement of shapes. 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).

What are the six basic molecular shapes?

  • Molecular Geometry from Trigonal Planar.
  • AB2E: bent.
  • Molecular Geometries from Tetrahedral.
  • AB3E: trigonal pyramidal (central atom + 3 outer atoms make a pyramid)
  • AB2E2: bent.
  • Molecular Geometries from Trigonal Bipyramidal.
  • AB4E: seesaw.
  • AB3E2: T-shaped.
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