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Unformatted text preview: drawing Lewis structures - valence electrons - electrons involved in chemical bonding dots placed on 4 sides of chemical symbol number of valence electrons in representative elements same as group number add all valence electrons o same # as group # for representative elements o add electron for each negative charge in anions o subtract electron for each positive charge in cations o only keep track of total number of electrons (no need to associate electrons to certain atoms) write symbols for atoms o central atom usually the least electronegative o single bond (2 shared electrons) represented by dash between atomic symbols complete octets of atoms o arrange dots so all atoms have 8 electrons o hydrogen only needs 2 in outer shell place extra electrons around central atom o even if it adds up to more than 8 use multiple bonds if not enough electrons o use unshared electron pairs to make double/triple bonds formal charge - charge of an atom if all atoms had the same electronegativity...
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