Atomic Theory Time Line

Cathode Ray Tube Experiment - J. J. Thomson knew that charged particles could be deflected in a magnetic field. Discovering electrons

Democritus- Believed all matter consisted of tiny indivisible particles made of all matter

J. J. Thomson- Discovered electrons

John Dalton- Proposed atoms were identical, atoms of a different element were different size. and all matter is made of atoms

Plum Pudding Model- Made by J. J. Thomson, stated atoms were made of different pieces with positive and negativr charge

Niels Bohr- Discovered atoms transferred energy, electrons orbit around the atom

Bohr Planetary Model- By Niels Bohr showed that electrons and atoms are in orbit with differing energy

James Chadwick- Discovered Neutron

Oil Drop Experiment- Using tiny drops of oil between two metal plates to discover the charge of electrons

Neils Bohr- Discovered electrons in atoms orbit the nucleus

Law of Conservation of Mass- Matter is neither created of destroyed

Rutherford Model

Ernest Rutherford - conducted the gold foil experiment

Gold Foil Experiment- Ernest Rutherford concluded atoms are mostly dense space with a positive charge nucleus

Antoine Lavoisier- Discovered Hydrogen and Oxygen

Robert Millikan- Discovered charge of an electron using oil drop experiement

Erwin Schrodinger- Found the likelihood of finding an electron using equations