How to draw lewis structure of ClO3^- with its formal charge

Question

theviper · Answer

http://www.youtube.com/watch?v=Bx5_ae6mA-A

lgbasallote · Answer

valence electrons               duet/octet
Cl                   7                                         8
3O             3 x 6 = 18                        3 x 8 = 24
                  =======                   =======
                         25                                       32
                       + 1   <---because the charge is negative so you add one electron
                       ===
                         26 

32 - 26 = 6

so the number of bonds is 3

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does that help?