chem notes 11-16 - Dr Stevens Gen Chem 1 Bonding-valence e...

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November 12, 2007 Dr. Stevens Gen. Chem. 1 Bonding -valence e- properties determine reactions and bonding -determine # of valence e- by group # for s/p group atoms group # = e- # -Lewis structures -e- dot structure -shorthand notation for representing valence e- -e- = • -element symbol has e- dots representing # of valence e- -n=2 shell -Li• -Be•• -B•• • -etc. -•• ••Ne•• •• = octet (stable) GOAL Compound notations -ionic -a compound of ionic bonds -complete transfer of e- -M low IE and low EA -NM high IE and high EA -Na + IE Na+ + e-; Cl + e- Cl- + EA = NaCl -alternate continuously…not a single molecule, but formula units November 16, 2007 Dr. Stevens Gen. Chem. 1 Chapter 9 Objectives: 1. Draw Lewis structures for molecules 2. use formal changes to predict better structure 3. know and identify exceptions to the octet rule Covalent -generally composed of all non-metals -high EA and ionization -overall, very similar -share e- b/w the 2 -if 1 e- pair is shared, use – (single bond) -if 2 e- pair is shared, use = (double bond)
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