2. Nuclear Fission The splitting of a nucleus into two smaller fragments

5. Nuclear Fusion The combining of small atomic nuclei to produce larger ones

6. Nuclear Fusion This is the reaction taking place on the sun We have duplicated it in hydrogen bombs No earthly materials will contain it Produces huge amounts of energy Fusion of 1g of hydrogen = 20 tons of coal Temperature can reach up to 50,000,000  C 2/1 H is very plentiful and easy to obtain Helium is inert and biologically stable Much work is being done on this reaction