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How to draw lewis structure for any compound (neutral molecule or polyatomic ion) which contains only Main Group elements joined by two-atom shared-pair covalent bonds. Step 1: Connectivity - arrange the atomic symbols so that covalently bonded atoms are contiguous. # the number of covalent bonds an atom forms is called its valence. # Some atoms have fixed valence. For example: H = 1, C = 4, F = 1. # Some atoms have variable valence. For example: O = 2 (sometimes 3), B, N = 3 (sometimes 4). # an atom bonded to only one other atom is peripheral (monovalent atoms such as H and F are always peripheral). # an atom bonded to two
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submitted by magiclko (4205 m) on 30 Sep 2007 17:49:45 IST (3 comments 1821 views)
