The Atomic Model Timeline

By chaseSmith45
  • 442 BCE

    Plato

    Plato stated that all matter is composed of particles called atoms
  • 400 BCE

    Democritus

    Democritus said that everything is made up into tiny bits called atoms, Democritus also discovered that atoms are indestructible and unchangeable.
  • 332

    Aristotle

    Aristotle created a theory about there being elements, other than that Aristotle didnt really play any role

  • Robert Boyle

    Robert Boyle also known as "The father of Chemistry" discovered that atoms must exist based on the relationship between pressure.

  • The Alchemists

    The alchemists developed the theory that all metals are composed of mercury and sulfur, they are discovered that it is possible to change.

  • Lavoisier

    Lavoisier found that total mass of products and reactants in a chemical reaction is always the same. This led to the theory of the law of conservation of mass.

  • John Dalton

    Dalton was the first scientist to explain the behavior of atoms in terms of measurement and weight.

  • Dmitri Mendeleev

    Mendeleev published the periodic table of elements. It arranged the known elements according to their chemical properties.

  • The Curies

    A pioneer in researching radioactivity, winning the nobel prize in physics in chemistry. The curries discovered radioactivity.

  • Albert Einstein

    Einstein was able to fully prove that atoms did exist. He also demonstrated that electrons could leave metal through usage of light.

  • Robert Millikan

    Millikan performed an oil drop experiment which measured electric charge. His hypothesis was to specify the size of the electrons charge.

  • Ernest Rutherford

    Rutherford discovered the atomic nucleus and received a nobel prize for study or radioactivity

  • Neils Bohr

    Neils Bohr created the solar system model. He discovered that the atom in the center has electrons orbiting it.

  • Henry G. J. Mosely

    Mosley observed and measured the spectra of 10 elements that occupied consecutive places in the periotic table.

  • Werner Heisenberg

    Heisenberg created a paper called the uncertainty paper which stated no object, no particle, or atom has a definite position.

  • J.J. Thomson

    Thomson discovered the electron. A negatively charged part of of every atom. His experiments with positively charged partciles.