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Science!!!!!
Chapter 16
Word | Desciption |
---|---|
Radioactivity | The process by which an unstable nucleus gibes 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 differnt number of neutrons ( and thus a differnt atomic mass) |
Half-life | The time needed for half of a sample of a radioactive substance to undergo radioacte decay |
Nuclear fission | The splitting of the nucleus of a large atom into two or more fragments |
Nuclear chain reaction | a continuous series of nuclear fission reactions |
Nuclear fusion | The combination of the nuclei of small atoms to form a lager nucleus; releases energy |