History of Models of Atom

By ghjkljhghoiryhf
  • 400 BCE

    Democritus

    Democritus discovered Atom theory and first proposed the idea that atoms have different shapes for different materials.
  • 330 BCE

    Aristotle

    Around 330 BCE Aristotle introduced his ideas that disagreed with Democritus' idea about atoms. Aristotle believed that elements, earth, fire, water, and air made up everything and not atoms.
  • 1492

    Columbus

    This is when Columbus arrived in America.

  • Robert Boyle

    Created Boyles law

  • American Revolution

    Start of American Revolution

  • John Dalton

    John Dalton came up with another version of Atomic Theory. All matter is made up of Atoms, all Identical elements have identical mass, Compounds are formed by two or more elements, Chemical reaction is a rearrangement of atoms.

  • American Civil War

    Start of the American Civil War

  • Dimitri Mendeleev

    Dimitri Mendeleev discovered the first Periodic Table of Elements.

  • JJ Thomson

    Thomson discovered the electron in 1897

  • Robert Milikan

    Discovered the charge of electrons

  • Ernest Rutherford

    Found that positive charge is found in the center of the Nucleus.

  • Hans Geigar

    Discovered tha atomic Nucleus

  • World War 1

    Start of WWI

  • Niels Bohr

    Learning more about the structure of atoms

  • James Chadwick

    Discovered Neutron

  • World War 2

    This is the start of WWII

  • Hiroshima

    This is when the bombing of Hiroshima started