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