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

18-10-2016

156. Atomic mass if the number of protons and neutrons within an atom.

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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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