4.2 structure of the nuclear atom
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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| scientists disproved dalton's "indivisible" atom by detecting... | subatomic particles: proton, neutron, electron
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| anatomy of an atom | atom=nucleus+electron cloud
*an atom is mostly empty space
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| the mass of an atom is in the... | nucleus
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| atom | the smallest particle of an element that retains the chemical properties of that element
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| the electron discovered by | J.J. Thomson
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| Thomson knew the Cathode ray was composed of negatively charged particles because | the rays are deflected away from a negatively charged object
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| Robert Millikan measured the exact...of the negative charge | value
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| the very small mass of an electron compared to the relatively large mass of an atom is an indication of what? | that there is probably a positively charged particle in the atom that has much more mass than the electron.
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