CHEM 101 Lecture Notes - Lecture 12: Beryllium, Beryllium Chloride, Electronegativity
Document Summary
Atoms try to achieve noble gas state. Can be multiple versions of a molecule. Count total number of valence electrons in molecule. Using these distinctions, assume the bond is ionic. For all other element pairs, assume covalent or polar covalent bonding. Then add lone pairs as needed for octet/duet. Add double or triple bonds to get total # electrons used to match total number valence electrons. Draw them in brackets with overall charge at upper right corner. More than one way to organize bonds in an electron. Electron distribution is even, so this means that some electrons are not localized to their bonds, but rather delocalized across the molecule. Total number of bonds/total number bonded regions. So, if you have a structure with one single bond and one double bond, you can calculate bond order by (2+1)/2 = 3/2. Fcx = valence of atom x - # bonds made with x - # non bonding e- around x.
