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10 Cards in this Set

  • Front
  • Back
the spontaneous disintegration in which small particles of matter and/or electromagnetic radiation are emitted by unstable atomic nuclei
radioactivity
the protons and neutrons in the nucleus
nuecleons
-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
-electrons
-travel at speeds close to the speed of light
-have a penetrating ability about 100 times that of alpha particles
beta particles
-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
an equation in which only nuclei are represented
nuclear equation
a change in the identity of a nucleus because of a change in the number of protons
transmutation
give off visible light after being exposed to sunlight
fluoresce
refers to the process in wich light-mass nuclei combine to form heavier, more stable nuclei
fusion
refers to the process in which a very heavy nucleus splits to form meduim-mass nuclei
fission