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18 Cards in this Set
- Front
- Back
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Democritus
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Greek philosopher, first person to propose the idea that matter was not infinitely divisible
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Aristotle
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influention in the rejection of the concept of the atom
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John Dalton
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Atomic theory was a breakthrough in our understanding of matter
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atom
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smallest particle of an element that retains the properties of the element
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cathode ray
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ray of radiation, originated from the cathode end of the tube. Stream of charged particles
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electrion
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negatively charged particles
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nucleus
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centrally located within the atom that contained all of an atom's positive charge and virtually all of its mass
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proton
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subatomic particle carrying a charge equal to but opposite that of an electron, positive charge of +1
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neutron
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has a mass nearly equal to that of a proton, but it carries no electrical charge
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J.J. Thomson
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identified the first subatomic particle-the electron
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building blocks of all atoms
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electrons, protons nucleus (all the mass of an atom
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Rutherford
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The Nuclear Atom (tiny, dense region centrally located within an atom that contains all of an atoms positive charge f virtually all of its mass.
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Nuclear Reaction
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reaction involving an atom of one element changing into an atom of another element
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Radioactivity
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the spontaneous emission of radiation by by some substances
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Radiation
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rays and particles emitted by the radioactive Material
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Radioactive decay
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process that doesn't require energy but allows unstable nuclei to lose energy by emitting radiation spontaneously
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subscript
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number of protons
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superscript
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Mass Number
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