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Homework Help: Atomic weight and noble gases in Mendelev's periodic table

  1. Oct 6, 2012 #1
    Why did Mendelev order the elements according to their atomic masses rather than their atomic number?

    Why did Mendelev not include noble gases in his periodic table?
  2. jcsd
  3. Oct 6, 2012 #2


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    Gold Member

    Simple : Because Noble gases weren't discovered at the time Mendeleev introduced his Periodic table.
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