Eugene Goldstein discovered positive particles by using a tube filled with hydrogen gas. It had a positive charge and was named the proton
Henri Becquerel was studying the fluorescence of pitchblend when he discovered a compound of pitchblend. Pitchblend gave a fluorescent light with or without sunlight.
Joseph John Thomson
Joseph ThomsonThompson discovered the electron and purposed the idea that the atom is a sphere of positive matter in which the electrons are positioned by electromagnetic forces.
Ernest RutherfordErnest Rutherford
Ruherford did a serice of experiments including shooting alpha particals into gas atoms. A few atoms were diflected implying a dense, positivly charged central region containing most of the mass of the atom.