Chemistry - oxidation numbers

How do you use a Lewis Structure to find the oxidation state of an element. I have this question using the oxidation rule i got +2, however how do i use it with Lewis structure.
QUESTION
Use the Lewis structure of a thiosulfate ion to find the oxidation number of each sulfur atom.

What are the advantages and disadvantages of using Lewis structures to assign oxidation numbers?

What are the advantages and disadvantages of using the oxidation number rules to assign oxidation numbers?

asked by Farah
  1. It takes a little reading and scrolling down the page but the S2O3^= ion is shown and the Lewis structure oxidation states are listed and explained. The first part of the article shows how the non-Lewis method is used.
    Notice that the article starts out by suggesting that we not confuse oxidation state and oxidation number.
    http://en.wikipedia.org/wiki/Oxidation_state

    posted by DrBob222
  2. Assign oxidation numbers to each atom in the following compounds:

    HI
    pbr3
    ges2
    kh
    as2o5

    posted by Noureldin

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