What scientist designed an experiment that enabled the first successful detection of an individual subatomic particle?
a. niels bohr
b. john dalton
c. j.j. thompson
d. robert millikan

The correct answer for this question is this one: "c. J.J. Thompson." J. J. Thomson is the scientist who designed an experiment that enabled the first successful detection of an individual subatomic particle. J.J. Thomson (Sir Joseph John Thomson, 1856-1940), who demonstrated in 1897 that "cathode rays" consisted of negatively-charged particles, later named electrons.

sorry, I'm not able to do it