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Count the number of electron groups around each carbon, recognizing that in the VSEPR model, a multiple bond counts as a single group. Use Figure \(\PageIndex{3}\) to determine the molecular geometry around each carbon atom and then deduce the structure of the molecule as a whole.
- Geometry of Molecules
Molecular geometry, also known as the molecular structure,...
- Geometry of Molecules
30 Ιαν 2023 · Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.
According to VSEPR, molecular shapes are best understood as resulting from the fundamental electrostatic force (Coulombic repulsion) of electrons repelling each other.
There is a three step approach to determining the geometry of a molecule. Determine the Lewis dot structure of the compound. Determine the Electron geometry from the Lewis dot structure. Determine the molecular geometry. It is very important from the onset that students understand the difference between electronic geometry and molecular geometry.
Molecular geometries (linear, trigonal, tetrahedral, trigonal bipyramidal, and octahedral) are determined by the VSEPR theory. A table of geometries using the VSEPR theory can facilitate drawing and understanding molecules. The table of molecular geometries can be found in the first figure. The second figure serves as a visual aid for the table.
Based on the steric number and the number of lone pairs, one can specify the name of the molecular geometry. We also use the “AXE” notational system, where “A” is the central atom, “X” are atoms attached to the central atom, and “E” is the number of lone pairs.
In today’s post, we will discuss the VSEPR theory which helps us understand the geometry of molecules. First, what does VSEPR stand for? It is the Valence Shell Electron Pair Repulsion theory. Notice the highlighted word ‘Repulsion’.
