regions of electron density

[Cavalli_1H]

what exactly do regions of 'electron density' mean? I know it would have to include bonds but does it include lone pairs as well?

[Kehlin Hayes 4C]

Yes it is the area that electrons are most likely found

[405268063]

Yes, regions of electron density include both bonds and lone pairs.

[MeeraBhagat]

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]

Why is knowing the number of regions of electron density necessary when naming a molecule?

[Ashley Kumar 3F]

its areas where electrons are most likely found so yes it does include lone pairs

[Lauren Sanchez 3D]

Regions of electron density include bonding pairs as well as lone pairs.

[Nare Arakelian Dis 3E]

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!

[Abigail_Hagen2G]

Recognizing regions of electron density does give an idea of the general shape, but the actual atoms give it a name.

[AryaG_4C]

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.

[Ayushi2011]

Regions where electrons are found, as the name suggests, the region where the electrons are most dense around an atom.