Molecules that Violate the Octet Rule
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Odd number of electrons
This is pretty rare Ex. NO, NO2, ClO2, HO
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Less than an octet on a central atom
rare Ex. Beryllium (2 bonds) Boron (3 bonds)
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Molecules with more than 8 electrons on central atom (hypervalent)
common: Can only happen with period 3 atoms and above and the molecules attached usually don't have a large electronegativity
Note 
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