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How to name As2S3?

  1. Mar 11, 2015 #1
    1. The problem statement, all variables and given/known data

    I thought that because Arsenic is not a non-metal, you don't use the number prefixes when naming compounds that are not non-metals. So my guess for As2S3 was Arsenic sulfide. But the actual answer is Arsenic trisulfide. Why is this?
    2. Relevant equations
    No relevant equations

    3. The attempt at a solution
    Arsenic sulfide
     
  2. jcsd
  3. Mar 11, 2015 #2

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    Distinguishes it from the di- and penta-sulfides, AsS and As2S5.
     
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