Why are LiCl and BCl3 examples of incomplete octects ?
[[ topic: chemical bonding and molecular structure ]]
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boron in BF3 can be said to have at least hints of an octet, because it has resonance structures in which lone-pair electrons are donated from F to B (a double bond between F+ and B-). ... Not only does every atom in the structure have an octet, but you also have minimal formal charges.
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Boron and aluminum, with three valence electrons, also tend to form covalent compounds with an incomplete octet. The central boron atom in boron trichloride (BCl3) has six valence electrons as shown in Figure 1.2. ... It is not possible for all of the atoms in such a molecule to satisfy the octet rule.
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