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unit 16 science
vocabulary from unit 16
Question | Answer |
---|---|
isotope | an atom that has the same number of protons as other atoms of the same element do but that has a differ number of neutrons |
radioactivity | the process in which an unstable nucleus gives off nuclear radiation |
alpha particle | have a greater charge and mass than beta or gamma do. made of 2 protons and 2 neutrons REMEMBER!!!! can be stopped by paper.......AND most dangerous particle |
beta particle | have a 1- OR a 1+ charge and almost no mass. can penetrate through more than an alpha particle. takes a couple millimeters of aluminum to stop |
gamma ray | has no mass or charge, the most penetrating of them all. pure beam of light. stopped by lead or concrete |
half life | the time it takes for a radioactive material to lose half of it radioactivity |
henri becquerel | discovered radioactivity ( didn't come up with the word for it ) |
mass number | the sum of the numbers of protons and neutrons in the nucleus of an atom |