chem history

Democritus

• Believed the world was made of 2 things, empty space and atomos, the smallest particles

John Dalton

• Developed the Atomic Theory; the same elements have same kinds of atoms and elements have different kinds of atoms

Thomson

• Discovered electrons with the cathode ray. It is a glass tube filled with gas at low pressure.

• Cathode rayt deflects away from negatively charged objects

Rutherford

• Hit alpha particles on gold foil. Something bounced back showing something is positive, which he called the nucleus.

Schrodinger

• Used matter wave theory to develop a model of the atom. Discover electrons are orbiting around the nucleus not sharply defined. 

• Write the equations of the shapes of the orbitals.

Chadwick

• Discovered the neutrons because something emitting neutral radiations has to be neutral.