jasmine76 jasmine76
  • 18-10-2016
  • Chemistry
contestada

What is the mass of an element with 78 protons and 78 neutrons

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Perlerbear
Perlerbear Perlerbear
  • 18-10-2016
156. Atomic mass if the number of protons and neutrons within an atom.
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OMAX OMAX
  • 18-10-2016
mass number=number of protons+number of neutrons
so mass number of the element you stated = 78+78 = 156 au
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