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Line 1: − 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== − *[[Atomic number]] − *[[Atomic mass]] − − ==References== − <references/> − − [[Category:Chemistry]] − [[Category:Physics]]
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