(Polar molecules, Non-polar molecules, etc.)
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A is the central atom and is typically 1. X is the number of atoms bonded to the central atom. E is the number of lone pairs around the central atom, A. The VSEPR formulas is very useful in determining the shape of the molecule.
In VSEPR notation, there are 3 symbols you need to know: A - the central atom; X - bonded atoms; and E - lone pairs. Then you look at the Lewis structure, see how many bonded atoms and lone pairs there are, and write those numbers in the subscripts by their symbols. For example, H2O is AX2E2, because there are 2 bonded atoms (the two H) and 2 lone pairs of electrons surrounding the central atom (O).
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