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10 Cards in this Set

  • Front
  • Back
alpha particle
a particle with two protons and two neutrons
alpha radiation
radiation made up of alpha particles
atom
smallest particle of an element that retains all the properties of that element
atomic mass
the weighted average mass of the isotopes of that element
atomic mass unit
one twelth of the mass of a carbon-twelve atom
beta particle
a high speed electron with a number one charge that is admitted during radioactive decay
beta radiation
radiation that is made up of beta particles
cathode ray
a ray of radiation that originates from the cathode and travels to th anode of a cathode ray tube
Dalton's atomic Theory
a theory proposed by John Dalton in 1908 based on numerous experiments that marked the beginning of the development of modern atomic theory
electron
a negatively charged fast moving particle with an extremely small mass