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

2 answers:

stepan [7]3 years ago

8 0

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

Reika [66]3 years ago

4 0

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

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