What scientist designed an experiment that enabled the first successful detection of an individual subatomic particle?

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.

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess