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29 Cards in this Set
- Front
- Back
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Atom |
the smallest particle of an element |
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Electron |
negatively charged subatomic particles. Particles of the atom that makes up most of the volume. The smallest part of an atom |
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Proton and Neutron |
Particle(s) of the atom that makes up most of the mass |
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Neutrons |
subatomic particles with no charge |
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Proton |
positively charged subatomic particles |
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John Dalton |
scientist that transformed Democrius' ideas on atoms into a scientific theory |
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Democritus |
suggested that atoms exist |
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atmos |
Greek term that means invisible |
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Billard Ball Model |
Dalton's model of the atom-- a solid sphere |
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Scanning Electron Microscope (SEM) |
instrament used to see atoms |
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J.J. Thomson |
discoverer of the electron |
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Corpuscles |
term used by Thomson to describe the negative particles |
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Cathode Ray Tube Experiment |
experiment conducted by J.J. Thomson |
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Cathode Ray |
glowing beam of electrons |
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Canal Ray |
faint glowing beam of protons in a ray tube |
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Plum Pudding Model |
the name of the atomic model proposed by J.J. Thomson |
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Robert Millikan |
scientist that discovered the charge on an electron |
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Oil Drop Experiment |
Millikan's experiment |
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-1 |
relative charge on an electron |
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1/1840 of that of a Hydrogen Atom |
Relative mass of an electron |
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0 |
overall charge on an atom |
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Eugen Goldstein |
scientist that discovered the proton |
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1840 times an electron's mass |
mass of a proton |
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+1 |
relative charge on the proton |
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James Chadwick |
scientist that confirmed the existence of neutron |
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Ernest Rutherford |
scientist that performed the Gold Foil Experiment |
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Alpha Particles |
helium atoms that have lost their electrons |
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Nuclear Atom |
the model of the atom proposed by Rutherford |
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Nucleus |
central core of the atom composed of protons and neutrons |
