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12 January, 15:46

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

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  1. 12 January, 17:03
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    Mass number=number of protons+number of neutrons

    so mass number of the element you stated = 78+78 = 156 au
  2. 12 January, 18:22
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    156. Atomic mass if the number of protons and neutrons within an atom.
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