theomniwasherer
theomniwasherer theomniwasherer
  • 20-03-2020
  • Chemistry
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There are 13 instances on the periodic table where the atomic mass does not increase along with atomic number. For each of these 13 instances, please provide the atomic number, name, and mass number of each pair of elements. For example: 18-Argon-40; 19-Potassium-39.
Use the back if necessary.

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nass72
nass72 nass72
  • 20-03-2020

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