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The sum of the number of neutrons and protons in the nucleus of an atom.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
The sum of the number of neutrons and protons in the nucleus of an atom.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
==See also==
*[[Atomic number]]
==References==
==References==
<references/>
<references/>
[[Category:Chemistry]]