CHEM 1101 Lecture Notes - Lecture 8: Yorkshire Carnegie, Lone Pair, Move

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25 Feb 2017
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If acid , group all o and h into -o-h groups. Tro try to complete all octets (i. e. fill the valence s and p orbitals) (nb. H only gets a total of 2 (not 8!) therefore it is satisfied with 1 single bond. ) Not enough electrons to complete the octets. You need 1 double bond for each 1 pair (2 electrons) missing. Or you need 1 triple bond for each 2 pair (4 electrons) missing. C atoms often form db"s quite often form tb"s. N atoms often form tb"s, quite often form db"s. Rarely to a halogen, never to f atom. Never have more than for bonds on a second row (li ne) atom. Expand the octet of the central atom (as long as it is in row 3 or lower on the periodic table) Ie. place the extra electrons, in pairs , on the central atom. **make sure every electron is accounted for at the end.

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