Democritus named the atom and thought it had spikes, hooks, and ball and socket joints.
John Dalton invented the idea of the scientific model
J.J Thompson discovered electrons and found out that atoms have a positively charged part and a negatively charged part.
Henry Becquerel and Pierre and Marie Curie discovered radioactivity.
Dmitri Mendeleev developed the periodic table.
Ernest Rutherford discovered that the positive charge comes from a tiny nucleus with neutrons in the center of the atom and electrons surround the nucleus.
