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4.2 structure of the nuclear atom

scientists disproved dalton's "indivisible" atom by detecting... subatomic particles: proton, neutron, electron
anatomy of an atom atom=nucleus+electron cloud *an atom is mostly empty space
the mass of an atom is in the... nucleus
atom the smallest particle of an element that retains the chemical properties of that element
the electron discovered by J.J. Thomson
Thomson knew the Cathode ray was composed of negatively charged particles because the rays are deflected away from a negatively charged object
Robert Millikan measured the exact...of the negative charge value
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.
Created by: v-ball7