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A coordinate covalent bond is an electron covalent bond where 2 electrons derive from the same atom. Specifically, this relates to Lewis Acid-Base reactions (Group 13 elements - B, Al, etc) and how they can be stable without satisfying the octet rule. For example, BF3 is stable even though B only has 6 valence e- taken up. The only way B could complete its octet is if another atom provides both of the other 2 e-, forming a coordinate covalent bond.
A coordinate covalent bond is when another atom provides an electron in order to complete an octet. In lecture, Dr. Lavelle displayed this by showing how Lewis bases donate electron pairs to Lewis acids, forming a coordinate covalent bond.
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