(Polar molecules, Non-polar molecules, etc.)
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Regions of electron density are the number of locations where electrons are more present. The number of regions is equivalent to how many atoms are bonded to the central atom plus any regions of lone pair electrons.
chari_maya 3B wrote:Why is knowing the number of regions of electron density necessary when naming a molecule?
The number of regions of electron density affect the shape of the molecule, but the naming of the molecule comes from only the bonded atoms, not the lone pairs. So if a molecule has 4 regions of electron density, but one of them is a lone pair, it is trigonal pyramidal and not tetrahedral. Hope this helps!
An example of when atom positions influence the shape is for the sulfite ion (SO3)^2-. In this, there are three bonding pairs and one lone pair. Thus, although the molecular shape tetrahedral to reduce repulsion the name of the shape is trigonal pyramid.
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