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

asked Jan 10, 2017 142k views

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

James Walford answered Jan 12, 2017

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mass number=number of protons+number of neutrons
so mass number of the element you stated = 78+78 = 156 au

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