History of Atomic Theory

  • Leucippus
    500 BCE

    Leucippus

    Earliest Greek philosopher to develop the atomic theory. Idea that everything is composed entirely of various imperishable
  • Democritus
    400 BCE

    Democritus

    Thought of first atomic theory.
  • Aristotle
    400 BCE

    Aristotle

    Everything is made up of earth, fire, water, air.
  • Paracelsus
    1530

    Paracelsus

    Was a Swiss physician, alchemist, and astrologer.
  • George Bauer (Georgius Agricola)
    1556

    George Bauer (Georgius Agricola)

    German mineralogist and metallurgist. Known as the "father of mineralogy."
  • Alchemy

    Alchemy

    The medieval forerunner of chemistry, based on the supposed transformation of matter.
  • Robert Boyle

    Robert Boyle

    Robert Boyle was a natural philosopher, chemist, physicist, and inventor. He is known as the first modern chemist.
  • Antoine Lavoisier

    Antoine Lavoisier

    Law of Conservation of Mass. Was a meticulous experimenter.
  • Joseph Proust

    Joseph Proust

    Law of definite proportion- masses of one element that combine with a fixed mass of another element while forming a compound with small whole number ratios.
  • John Dalton

    John Dalton

    Proved the first atomic theory.
  • Jons Jakob Berzelius

    Jons Jakob Berzelius

    Berzelius was a Swedish chemist. He is considered to be one of the founders of modern chemistry.
  • Joseph Gay-Loussac

    Joseph Gay-Loussac

    Was a French chemist and physicist. He is known for his discovery of pressure and temperature, his two laws related to gases, and for his work alcohol-water mixtures.
  • Amedeo Avogadro

    Amedeo Avogadro

    Was an Italian scientist that was noted for his contribution to the molecular theory.
  • J.J. Thomson

    J.J. Thomson

    Experimented with the Crookes tube. He was Crookes student.
  • Henri Becquerel

    Henri Becquerel

    Becquerel was a French physicist and the first person to discover evidence of radioactivity.
  • Robert Millikan

    Robert Millikan

    An American experimental physicist. He was honored with the Nobel Peace Prize for the measurement of the elementary electric charge and his work on photoelectric effect.
  • Ernest Rutherford

    Ernest Rutherford

    A British physicist who came to be known as the father of nuclear physics.
  • Max Planck

    Max Planck

    A German theoretical physicist whose discovery of energy quanta won him the Nobel Peace Prize in physics in 1918.
  • Niels Bohr

    Niels Bohr

    A Danish physicist who made foundational contributions to understanding atmoic structure and quantam theory.
  • Arthur Compton

    Arthur Compton

    An American physicist who won the Nobel Peace Prize in 1927 for his discovery of the Compton effect in 1923. The Compton effect demonstrated the particle nature of electromagnetic radiation.
  • Louis de Broglie

    Louis de Broglie

    A French physicist who made groundbreaking contributions to the quantum theory.
  • Werner Heisenberg

    Werner Heisenberg

    A German theoretical physicist and one of the key pioneers of quantam mechanics.
  • Erwin Schrodinger

    Erwin Schrodinger

    A Noble Peace Prize-winning Austrian physicist who developed a number of fundamental results in the filed of quantum theory.
  • James Chadwick

    James Chadwick

    British physicist who was awarded the 1935 Nobel Peace Prize in physics for his discovery on the neutron in 1932.
  • Murray Gell-Mann

    Murray Gell-Mann

    An American physicist who received the 1969 Nobel Peace Prize in physics for his work on the theory of elementsry particles.
  • Carlo Rubbia

    Carlo Rubbia

    An Italian particle physicist and inventor who was awarded the Nobel Peace Prize in 1984 for his work leading to the discovery of the W and Z particles.
  • Peter Higgs

    Peter Higgs

    A British theoretical physicist that was awarded the Nobel Peace Prize for his work on the mass of subatomic particles.