atomic timeline

By bilalA
  • 427 BCE

    plato

    plato
    Solids are made of triangle shaped elements. Believed triangle are the correct shape for atoms. Also was born in Athens.
  • 400 BCE

    Democritus

    Democritus
    believed atoms where undefined and incompressible. And thought atoms moved in infinite numbers. Also made the formula of the atomic theory
  • 330 BCE

    solar system model

    solar system model
    Illustrates the relative positions and motions of the planets. Made by Nicholas Copernic's.
  • 1500

    The Alchemists

    The Alchemists
    Created the atomic alchemist theory. And attempted making gold from lead. Also found experimental tools and techniques.

  • Robert Boyle

    Robert Boyle
    Added the theory of mechanics. Alleging that all substances could be described as motion. And is the pioneer of atomic method.

  • Antoine Lavoisier

    Antoine Lavoisier
    Defined law of conversavtions of mass. Found out that combustion and respiration are caused by chemical reactions.

  • John Dalton

    John Dalton
    Suggested that atoms are indestructible and invisible. And introduced the atomic theory in chemistry.

  • Billiard ball model

    Billiard ball model
    Model of a atom refers to similar structure of a atom made by john Dalton.

  • Amedeo Avogadro

    Amedeo Avogadro
    Found that equal volumes of gasses at the same temp had same particles. Also published a french journal on physics. He also corrected Dalton's formula for water.

  • Dimitri Mendeleev

    Dimitri Mendeleev
    He built the periotic table. He was a chemist also he was Russian.

  • Electron cloud model

    Electron cloud model
    Is a function that can calculate and use wave like behavior's to find electrons. Made by Warner Heiserngrey.

  • Pierre and Marie and curie

    Pierre and Marie and curie
    Proved radioactive particles cause atoms to break down.

  • JJ Thompson

    JJ Thompson
    Found all atoms contain electrons the first subatomic particle to be found. Used plum pudding as a model.

  • Plum pudding model

    Plum pudding model
    Depicts electrons as negatively charged. Embedded in positive charge.

  • albert einestein

    albert einestein
    Proved the existence of atoms. Also made mass Equivalence energy formula.

  • Ernest Rutherford

    Ernest Rutherford
    Proved atoms have a nucleus where mass is concentrated. Also was born in new Zealand.

  • Robert Millikan

    Robert Millikan
    Discovered change of electron. Also found the measurement of a electricals charge in a atom.

  • Henry G.J.Mosley

    Henry G.J.Mosley
    showed major props are determined by atomic numbers. He was also a English's physicist.

  • James Chadwick

    James Chadwick
    Discovered the neutron Another subatomic particle. And also received a noble prize.

  • Nelis Bohr

    Nelis Bohr
    Proposed theory for the hydrogen atom. Based on quantum theory. Made foundational contributions to understanding the atomic theory