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The atomic and mass numbers for four different atoms are given below. Which two are isotopes?
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The atomic and mass numbers for four different atoms are given below. Which two are isotopes?

The atomic and mass numbers for four different atoms are given below. Which two are-example-1
User Sean Vikoren
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W and X because isotopes have the same atomic number (protons) but different mass and therefore different amounts of neutrons
User JPark
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