beginning of atomic theory
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Moseley | discovered that all atoms of an element have the same number of protons
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| In a single neutral atom the number of protons equals the number of | electrons
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| Ion | an atom that has lost or gained electrons
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| The average mass of an element's atoms | atomic mass
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| 1 AMU equals | 1 / 12 the mass of a carbon-12 atom
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| isotopes | atoms with the same number of protons but a different number of neutrons
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| How do you calculate the charge of an atom? | protons minus electrons
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| What lead to idea that cathode rays had neg charged particles? | the magnet..
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| Thomson | figured out the charge to mass ratio
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| Miliken | found the charge of a single electron
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| Becquerel | figured out natural radioactivity with the crystals. used radium and pulonium in experiments
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| Thomoson's Model | grapes in jello, positively charged with negative charge in it, did not know how they arranged
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| Rutherford | developed nuclear model of atom
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| rutherford 2 | gold foil --> nucleus
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| Types of radiation | alpha, gamma, beta
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| alpha | positive (4amu)
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| beta | negative (1amu) electron
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| gamma | radiation
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| Michael Faraday | suggested structure of atom somehow related to electricity
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| Cathode | negative
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| Anode | positive
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| Henri Becquerel discovered radioactivity while working with | uranium
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| charge of a nucleus | positive
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| static electricity | electric charges that are not in motion
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| cathode ray | stream of particles orginating from a cathode
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| coulomb | SI unit of electrical charge = 1 electron
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| radioactivity | spontaneous emission of radiation from an element
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| gamma radiation | radiation similar to xrays that is not composed of particles
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| alpha particle | particle with +2 charge emitted by radioactive elements
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| oil drop | done by miliken, measures the charge of a single electron
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| law of multiple proportions | (blank)
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