The smallest unit of an element. Chemical energy Energy released as a result of chemical reactions. For example, by burning hydro carbons in the presence of oxygen, chemical energy would occur. It behaves like hydrogen in chemical reactions but behaves significantly differently in fusion reactions with tritium since deuterium and tritium fuse more easily than hydrogen. Electron A negatively charged sustainable elementary particle that consists of ordinary matter.
Atoms consist of a positively charged nucleus surrounded by a cloud of negatively charged electrons.
Electrons emitted from the nucleus of an atom are called beta particles. A fundamental substance which can occur in nature, composed of atoms having identical numbers of protons. The lightest element is hydrogen, with a single proton in its nucleus which characterizes all isotopes of hydrogen. Deuterium and tritium are isotopes of hydrogen. Fission Nuclear reaction in which a larger atomic nucleus splits into two or more smaller nuclei with the release of large amounts of energy.