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  1. The weights of each stable isotope and their percent abundances in nature. https://www.chemteam.info/Mole/AverageAtomicWeight.html

    2 Answers · Science & Mathematics · 15/09/2020

  2. ...on  .. .. . the periodic table.  That is because they don't have any stable / naturally .. .. . occurring isotopes.  So the "relative isotopic...

    1 Answers · Science & Mathematics · 06/09/2020

  3. Sodium is a chemical element with the symbol Na and atomic number 11. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is (Na).

    1 Answers · Science & Mathematics · 23/09/2020

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