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Two or more atoms that have the same number of protons, but different numbers of neutrons.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
Two or more atoms that have the same number of electrons, but different numbers of neutrons.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
==References==
==References==