ianbmx841 ianbmx841
  • 10-02-2022
  • Chemistry
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What is the mass number for an atom of barium containing 56 protons and 82 neutrons?.

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megumihayashi0624200
megumihayashi0624200 megumihayashi0624200
  • 10-02-2022
Answer: 138

Explanation: mass number - protons (atomic number) = neutrons
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