In the Early 1900s, Ernest Rutherford Performed an Experiment with Gold

In the early 1900s, Ernest Rutherford performed an experiment with gold foil targets and alpha particles to probe the structure of the atoms.He observed that most of these alpha particles penetrated the foil undeflected.Realizing that atoms are electrically neutral (that is, they have equal numbers of protons and electrons)and that the mass of a proton is significantly greater than the mass of an electron, use Rutherford's data to propose a structural model of an atom.