Dalton's billiard ball model was based on which of the following ideas? a. the atom is solid and indivisible. b. a proton is much smaller than a neutron. c. the atom can be spontaneously divided. d. a proton is much smaller than an electron.

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the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.