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See Energy Content Note: The reactions discussed on this page are all nuclear reactions not chemical reactions.

Practical applications of the use of nuclear energy to generate electricity are given on the Nuclear Energy - The Practice page The diagram above shows a representation of the constituents of an atom using Lithium as an example.

In nuclear reactions it is the sub-atomic particles in the atomic nucleus, the protons and neutrons, which rearrange themselves to form new elements or isotopes with more stable nuclei.

In this case the energy released by the reaction in the form of kinetic energy (manifest as heat) and electromagnetic energy (gamma radiation) is millions of times greater.

The isotope U-235 is important because under certain conditions it can readily be split, yielding a lot of energy.

Choose: No Frames Layout Choose: Human Evolution Frames .When we look at sand in an hourglass, we can estimate how much time has passed based on the amount of sand that has fallen to the bottom.Radioactive rocks offer a similar “clock.” Radioactive atoms, such as uranium (the parent isotopes), decay into stable atoms, such as lead (the daughter isotopes), at a measurable rate.Radioactivity was discovered following experiments on the luminescence of uranyl double sulphate crystals caused by exposure to ultraviolet light.The phenomenon was noted in the walls of cathode ray tubes and this led Henri Becquerel to determine whether uranium compounds emit X-rays.The work that he and his colleague Frederick Soddy did on the radioactivity of thorium compounds resulted in the formation of the theory of radioactive decay and growth.