The Lewis structure of a molecule is a representation of the valence electrons in the molecule using dots.
The structure of a molecule is easily shown using dots to depict valence electrons and sometimes a dash to indicate two electrons that are shared in a bond.
The structures of PF3, HCN and CF2Cl2 have been shown here.
PF3 has a trigonal bipyramidal molecular geometry. HCN has a linear molecular geometry while CF2Cl2 has a tetrahedral molecular geometry. Note that the molecular geometry shows the number and arrangement of atoms present in the molecule.
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