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The sum of the number of neutrons and protons in the nucleus of an atom.<ref>Wile, Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000.</ref> The atomic number is determined by the isotopic atomic weight.
The '''mass number''' is the sum of the number of [[neutron]]s and [[proton]]s in the [[nucleus]] of an [[atom]].<ref>Wile, Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000.</ref> The atomic number is determined by the [[isotope|isotopic]] atomic weight.
==See also==
==See also==