Atomic History Timeline

Democritus - He discovered the atom - Was known to be first one to call them atoms

Aristotle - Believed that Democritus was wrong - The world was made up of 4 elements

Lavoisier - Breakthrough with studying chemical reactions - Created the Law of Conservation of Mass

Dalton - said matter was made up of atoms - atoms of certain elements have the same in every way

My Birth

My Parents' Birth

Columbus's Voyage

Sinking of the Titanic

End of World War I

End of the Civil War

End of Revolutionary War

End of World War II

Avogadro - simple gases were formed of compound molecules of two or more atoms - oxygen had split into two atoms in the course of forming water vapor

Berzelius - rejected Dalton's symbols for elements - found atomic weights of 45 elements in lifetime

Thomson - founded the electron - thought atoms were made up of positive charges to balance out negative ones

M. Curie - founded radium and polonium - first woman in France to achieve professorial rank

Planck - created Planck's radiation law - formula that related the energy of the radiation to its frequency

Millikan - determined the unit charge of the electron - formed a formula that calculates the mass of the electron and the positively charged atoms

Bohr - Said electrons in atoms orbit the nucleus - The laws of classical mechanic applied to the motion of electrons

Moseley - created Moseley's law - found the three unknown elements between aluminum and gold

Rutherford - discovered the proton - discovered the possible existence of the eutron

Heisenberg - founded the Uncertainty Principle - electrons surround the outside of an atomic nucleus in the electron cloud

Schrodinger - developed model for electron cloud - mathematically determined the regions where electrons would most likely be found

Chadwick - first to talk about neutrons - created the model we use today