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10 Cards in this Set
- Front
- Back
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the spontaneous disintegration in which small particles of matter and/or electromagnetic radiation are emitted by unstable atomic nuclei
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radioactivity
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the protons and neutrons in the nucleus
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nuecleons
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-helium nuclei
-have a charge of +2 -move at a speed approx. one-tenth the speed of light -have relatively low penetrating ability |
alpha particles
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-electrons
-travel at speeds close to the speed of light -have a penetrating ability about 100 times that of alpha particles |
beta particles
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-high energy electromagnetic waves
-produced when nuclear particles undergo transitions in nuclear energy levels -the most penetrating of the radiations given off by radiactive isotopes |
gamma rays
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an equation in which only nuclei are represented
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nuclear equation
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a change in the identity of a nucleus because of a change in the number of protons
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transmutation
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give off visible light after being exposed to sunlight
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fluoresce
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refers to the process in wich light-mass nuclei combine to form heavier, more stable nuclei
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fusion
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refers to the process in which a very heavy nucleus splits to form meduim-mass nuclei
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fission
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