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MC physical science
Chapter 16 Atomic Energy
Word | Definition |
---|---|
radioactivity | the process by which an unusable nucleus in the nucleus gives off nuclear radiation |
mass radio | the sum of the numbers of protons and neutrons in the nucleus of an atom |
isotopes | an atom that has the same amount of protons as other atoms of the same element do but has a different number of neutrons |
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 two or more fragments; releases additional neutrons and energy |
nucleus chain reaction | a continuous series of nuclear fission reactions |
nuclear fusion | the combination of the nuclei of smaller atoms to form a larger nucleus; releases energy |