Which particle is j. j. thomson credited with discovering? electron neutron proton photon

Electron

Explanation:

Thomson discovered the electron performing a series of experiments with cathode ray tubes. He measured the charge and mass of the cathode rays when they were deviated by a magnetic field, finding a particle lighter and with more charge than that of the hydrogen ion. With this, he concluded that the atoms were divisible and imagine the atom like a sea full of positive charges with negative charge particles within it. His atomic model is also known as the plum pudding model.

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.