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An oxide of element F has the formulaF2O5

  1. Determine the oxidation state of F.
  2. In which group of the periodic table is element F? 

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  1. F2O5 = O
    2F + 5(−2) = 0
    2F+−10=0
    2F = 0+10
    2         2 
    F= +5  
  2. Group V
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