(Polar molecules, Non-polar molecules, etc.)
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A refers to the central atom, X refers to the number of bonds and E represents lone pairs. However, just remember when you have a radical, you treat that lone electron like a loan pair. So, essentially, E usually represents lone pairs of electrons, however it is important to note that radicals are treated the same as lone pairs when finding molecular geometry
Usually A will not be accompanied by a number as it represents the central atom of the molecule. Whatever number follows X represents how many atoms are bonded to the central atom A. The number that comes with E represents how many lone pairs there are on the molecule's central atom.
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