lalafer8184 lalafer8184
  • 19-05-2017
  • Biology
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An atom contains 70 protons, 70 electrons, and 99 neutrons. what is the mass number?

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EcapGang
EcapGang EcapGang
  • 19-05-2017
how bout you try adding the numbers up or adding the two 70s then subtracting the 99
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