-
450
Democritus (~460 B.C.)
Asked the question of how small can you get. He then named the smallest of matter atoms. -
450
Aristotle (~460 B.C.)
Aristotle dismissed the idea of the atom, saying that it was useless. Since Aristotle dismissed this, so did everyone else. -
John Dalton
Learned that matter was infact made of particles, though he did not know the structure. -
J.J. Thomson
Found the electron and knew that they must be negative, and that matter was positive, Made the plum-pudding model. -
Max Planck
Showed that when atoms vibrate strongly, you can only measure in quantas. -
Neils Bohr
Found that electron circled the atom at certain distance, and that jumping rings causes nuclear reactions. -
Ernest Rutherford
Found that electrons circle the atom. Also identified the nucleus and named the partices it consists of protons. -
Erwin Schrodinger
Finds the electron cloud. -
James Chadwick
Discovers the neutron. -
Gell-Man
Discovers the quark.