2. Material was developed by combining Janusa\'s material with the lecture outline provided with Ebbing, D. D.; Gammon, S. D. General Chemistry, 8th ed., Houghton Mifflin, New York, NY, 2005. Majority of figures/tables are from the Ebbing lecture outline.. Nuclear Chemistry. Radioactive decay is the process in which a nucleus spontaneously disintegrates, giving off radiation. .