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18 Cards in this Set

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