VSEPR and VB theories-1

VSEPR and VB theories-1 - REGIONS OF HIGH ELECTRON DENSITY...

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REGIONS OF HIGH ELECTRON DENSITY OR CONCENTRATION (r.h.e.d.) Around each central atom, the regions of high electron density are determined as follows: 1- Each atom around a central atom around a central atom is considered as ONE r.h.e.d., regardless of its number of bonds with the central atom. 2- Each lone pair on the central atom is considered as ONE r.h.e.d. Examples: VSEPR THEORY The basic idea of the VSEPR theory is the following: Regions of high electron density repel each other. Therefore, they need to be arranged as far apart from each other as possible around the central atom. Most molecules and polyatomic ions have: 2, 3, 4, 5, or 6 r.h.e.d. The electronic geometry describes the arrangement of the r.h.e.d, around the central atoms. With 2, 3, 4, 5, or 6 regions we have 5 different electronic geometries. # r.h.e.d. electronic geometry The molecular geometry describes the arrangement of atoms around the central atom. The molecular geometry is deduced from the electronic geometry.
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