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Atomic Energy
term | definition |
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Radioactivity | the process by which an unstable nucleus gives off nuclear radiation |
Mass Number | the sum of the numbers of protons and neutrons in the nucleus of an atom |
Isotope | an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass) |
Half-Life | the time needed for half of a sample of a radioactive substance to undergo radioactive decay |
Nuclear Fission | the splitting of the nucleus of a large atom into two or more fragments; releases additional neutons and energy |
Nuclear Chain Reaction | a continuous eries of nuclear fission reactions |
nuclear fusion | the combination of the nuclei of small atoms to form a larger nucleus; releases energy |