Electrons and protons possess equal but opposite charges, despite the significant size difference, as electrons are much smaller than protons. Protons are composite particles made of quarks, which carry fractional charges, while electrons are fundamental particles with a charge of -1. The discussion highlights that there are other charged particles beyond just protons and electrons, raising questions about the nature of charge itself. The relationship between mass, size, and charge is complex, and current understanding suggests that these properties do not directly correlate. Ultimately, the reasons behind the specific charges of particles remain largely unexplained in physics.