4.6 Molecular Shape. To determine the shape around a given atom, first determine how many groups surround the atom. A group is either an atom or a lone pair of electrons. Use the VSEPR theory to determine the shape. The most stable arrangement keeps the groups
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The idea of VSEPR is that the valence electron pairs surrounding an atom mutually repel each other, and will therefore adopt an arrangement that minimizes this repulsion, thus determining the molecular geometry.
The classification of a molecule as polar or nonpolar
Nonpolar molecules generally have:
Polar molecules generally have: