Question #e5346

1 Answer
anor277
Sep 29, 2016

First you need #Z#, #"the atomic number"#.

Explanation:

And #"Mass number"-"Atomic number"# #=# #"Number of neutrons"#.

Both neutrons and nuclear protons are the massive particles of the atom, and both contribute to the mass of an isotope. You need both to make the determination of mass.

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