Atomic theory

By IrvineC01
  • 460 BCE

    Democristus

    Democristus
    The first person to discover the idea of the atomic theory. His idea of atomic theory was if you cut something and kept cuting into smaller and smaller pieces then; at some point, there would be a piece which would be so small as invisible. He would call that a atoms
  • 400 BCE

    Aristotle

    Aristotle
    He believes that earth is made up of Earth, Fire, Water, and Air.

  • Isaac Newton

    Isaac Newton
    matter is made up small indestructible units he called atoms

  • John dalton

    John dalton
    His theory of atomic theory was that the atom invisible and indestructible building blocks.

  • Michael faraday

    Michael faraday
    He contributed with using his knowledge in electromagnetism and electrochemistry, and how electrical forces was responsible for joining atoms compounds.

  • J.plucker

    J.plucker
    Built one of the first gas discharge tubes

  • Dmitiri Mendeleev

    Dmitiri Mendeleev
    Discovered a relating pattern in chemical properties, when the elements are organised it increases in atomic mass

  • Sir William crookes

    Sir William crookes
    He made the discovery of the element thallium

  • E.goldstein

    E.goldstein
    He discovered protons

  • G.j. Stoney

    G.j. Stoney
    He introduced the term electron

  • J.j Thompson

    J.j Thompson
    Thomson made a discovery that the solid ball model of the atom was wrong.

  • Rutherford

    Rutherford
    He tested how alpha particles were fired to to a sheet of gold foil. Which it proved the existence of a nucleus

  • Marie sklodowska curie

    Marie sklodowska curie
    She and her husband Pierre discovered the radioactive elements polonium and radium.

  • Max Planck

    Max Planck
    His work contributed significantly to the understanding of atomic and subatomic processes.

  • Fredrick Soddy

    Fredrick Soddy
    He was involved and we'll know for nuclear reactions. He also proved the existence of isotopes of certain radioactive elements.

  • Hantaro nagaoka

    Hantaro nagaoka
    He made a planetary model of the atom, which made two predictions.

  • Richard abegg

    Richard abegg
    the number of other atoms with which an atom of the element can combine.

  • H.g.j. Moseley

    H.g.j. Moseley
    Determined the atomic number of each element known.

  • Francis William Aston

    Francis William Aston
    He founded a device that separates and measures atoms or molecular fragments.

  • Niels Bohr

    Niels Bohr
    He found the idea on the fact gravity pulls things together

  • Louis de broglie

    Louis de broglie
    He founded the theory and for predicting the wave nature of electrons.