Subatomic Particles

• The Electron - A Negatively Charged Subatomic Particle
  
  George Stoney proposed that a negatively charged particle associated with the atom existed and suggested the new particle be called an electron
• The Proton - A Positive Charged Subatomic Particle
  
  Knowing that the atom is electrically neutral and the electron has almost no mass, scientists began to suggest that a positively charged particle must exist in order ...
• The Neutron - A Neutrally Charged Subatomic Particle
  
  In 1920 Rutherford suggested the existence of another subatomic particle to account for the difference between the mass of the nucleus and the ...
• The Photon