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    Ive learnt these oxidation numbers...
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    But im so confused with how id know the ones for the other elements eg) Mn has +4 ... Where does this come from?


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    Ive worked them out now, can anyone explain when group 4 elements are + or - ?


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    (Original post by clara16)
    Ive worked them out now, can anyone explain when group 4 elements are + or - ?


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    They can be both and are defined by what they are bonded to e.g:
    CH4 - H=+1 so C=-4
    CO2 - O=-2 so C=+4
    and so on.
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    I seeee. Thank you


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    (Original post by clara16)
    Ive learnt these oxidation numbers...
    Name:  ImageUploadedByStudent Room1389540858.459730.jpg
Views: 77
Size:  54.1 KB
    But im so confused with how id know the ones for the other elements eg) Mn has +4 ... Where does this come from?


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    Mn has a variable oxidation state (it is a transition metal), which means that it will vary depending on the other species it is bonded to.
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    The ones you have listed are used to calculate other oxidation numbers using well defined rules (see here for example), so you don't have to remember them.
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    Tysm


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