The energy of inter-atomic or chemical bonds, which holds atoms together in compounds.

Radioactivity, the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles

Nuclear energy, energy produced by nuclear reactors

List of environment topics

Nuclear reaction, a process in which two nuclei or nuclear particles collide, to produce different products than the initial products; see also nuclear fission and nuclear fusion

The term may have originated with H. G. Wells in the phrase, "splitting the atom", devised at a time prior to the discovery of the nucleus. The term is a solecism.