(Polar molecules, Non-polar molecules, etc.)
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The VSEPR formula is a way to denote how many central atoms, bonded atoms, and lone-pairs there are on the molecule. It follows the pattern of AnXnEn, where A is the central atom, X is a bonded atom, E is a lone pair, and the subscript n is the number of each. So a molecule with 3 bonded atoms around the central atom and 2 lone pairs would be AX3E2 and T-shaped.
It is asking for the formula AXbEc, where A is the central atom, X is a ligand (unspecific) with subscript b as the number of ligands attached to A, and E indicates a lone pair with subscript c describing the number of lone pairs on central atom A.
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