فهرست عناصر بر پایه جرم اتمی

این صفحه فهرست عناصر بر اساس عدد اتمی 
است که منبع آن IUPAC  بوده‌است و برای خطا به طور مثال, 1.00794(7) این‌گونه معنی می‌دهد 1.00794 ± 0.00007.برای عناصر پرتوزا پایدارترین ایزوتوپ آن نوشته و درون [] قرار داده شده‌است .

دمیتری مندلیف

یادداشت 
  The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However, three elements, Thorium, Protactinium, and Uranium, have a characteristic terrestrial isotopic composition, and thus their standard atomic weights are given.
  The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.
  The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.
  The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.
  The atomic weight of commercial Lithium can vary between 6.939 and 6.996—analysis of the specific material is necessary to find a more accurate value.

منابع 

 IUPAC Standard Atomic Weights Revised (2007).  Atomic weights of elements with atomic numbers of 28, 30, 42, 70 & 71 taken from this source.
 WebElements Periodic Table.  Retrieved on June 30, 2005.  Atomic weights of elements with atomic numbers of 110-116 taken from this source.

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