Atomic Timeline

  • 400


    460 B.C.- 370 B.C.
    A Greek philosopher that created the idea of the atom.
    *was not able to put date in B.C. years.*
  • Period: 400 to

    Atomic Timeline

  • Isaac Newton

    Isaac Newton
    Proposed the ideas of atoms after democritus in 1704. He decribed our world as "A mechanical universe where small solid masses were in motion", which also gave his idea that atoms stay in motion.
  • John Dalton

     John Dalton
    He proposed the first Atomic Theory and introduced the first model of the atom called the Billiard Ball model. This name was given becuased he viewed the atom as a soild ball. He also found that atoms of the same element are identical, but atoms of different elements are different by their physical and chemical properties.
  • Michael Faraday

     Michael Faraday
    An English scientist who contributed to the fields of electromagnetism and electrochemistry. He studied the effect of electricity on solutions, coined term "electrolysis" as the splitting of molecules with electricity, and developed the laws of electrolysis.
  • Julius Plücker

    Julius Plücker
    He was a German mathematician and physicist. He built one of the first cathode ray tubes which later lead to the discovery of the electron.
  • Dmitri Mendeleev

    Dmitri Mendeleev
    He was a Russian chemist and inventor. He discovered Periodic law by arranging all the known elements into 7 groups with similar properties. He then discovered that the properties of elements were periodic functions of the their atomic weights which he organized into a famous diagram call the periodic table.
  • James Clerk Maxwell

     James Clerk Maxwell
    He was a Scottish mathematical physicist. He helped the atomic feild by proposing that electric and magnetic fields filled the void of an atom. This is known as the theory of electromagnetic radiation.
  • Sir William Crookes

     Sir William Crookes
    1832 –1919
    He was a British chemist and physicist who worked on spectroscopy. He discovered the properties of cathode rays, some of his observations were that the rays traveled in straight lines, caused glass to fluoresce, imparts a negative charge to objects they strike, deflects by electric fields and magnets to suggest a negative charge, and causes pinwheels in their path to spin indicating they have mass.
  • Eugen Goldstein

    Eugen Goldstein
    He was a German physicist who was an early investigator of discharge tubes, the discoverer of anode rays, and is sometimes credited with the discovery of the proton.
  • George Johnstone Stoney

    George Johnstone Stoney
    1826 –1911
    He was an Anglo-Irish physicist. He is most famous for introducing the term electron as the "fundamental unit quantity of electricity". Although he had introduced the concept, he didnt introduced the word.
  • Wilhelm Roentgen

     Wilhelm Roentgen
    He was a German physicist. Using a cathode ray tube he observed that nearby chemicals glowed. Further experiments found very penetrating rays coming from the cathode ray tube that were not deflected by a magnetic field. He named them Röntgen rays, today known as X-Rays.
  • Henri Becquerel

     Henri Becquerel
    He was a French physicist. While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays. This is when he discovered the effects of radiation.
  • Joseph John Thomson

    Joseph John Thomson
    He was an English physicist. He showed that cathode rays were composed of a previously unknown negatively charged particle, and is credited with the discovery of the electron. He is also credited with finding the first evidence for isotopes of a stable element as part of his exploration into the composition of canal rays. He also invented the mass spectrometer.
  • Ernest Rutherford

     Ernest Rutherford
    He was a New Zealand-born British physicist who became known as the father of nuclear physics. He discovered the concept of radioactive half-life, proved that radioactivity involved the transmutation of one chemical element to another, and also differentiated and named alpha and beta radiation.
  • Marie Sklodowska Curie

     Marie Sklodowska Curie
    She was a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity. She studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium.
  • Frederick Soddy

     Frederick Soddy
    1877 -1956
    He was an English radiochemist. He explained that radioactivity is due to the transmutation of elements, now known to involve nuclear reactions. He also observed spontaneous disintegration of radioactive elements into variants he called isotopes and discovered "half-life", which made initial calculations on energy released during decay.
  • Max Planck

    Max Planck
    He was a German theoretical physicist who originated quantum theory. He used the idea of quanta (discrete units of energy) to explain hot glowing matter.
  • Hantaro Nagaoka

    Hantaro Nagaoka
    He was a Japanese physicist and a pioneer of Japanese physics during the Meiji period. He postulated a "Saturnian" model of the atom with flat rings of electrons revolving around a positively charged particle.
  • Richard Wilhelm Heinrich Abegg

    Richard Wilhelm Heinrich Abegg
    He was a German chemist and pioneer of valence theory. His valence theory was that inert gases had a stable electron configuration which lead to their chemical inactivity.
  • Albert Einstein

    Albert Einstein
    Hev was a German theoretical physicist and philosopher of science. He developed the general theory of relativity and the mass- energy equivlance formula E = mc. These achivements helped to establishing quantum theory.
  • Hans Geiger

    Hans Geiger
    He was a German physicist. He is responciple for discovering the nucleus of an atom. He is also known as the co-inventor of the Geiger counter and took part of the Geiger–Marsden experiment, both which lead him to his discovery.
  • Robert Andrews Millikan

    Robert Andrews Millikan
    He was an American experimental physicist who was known for his work on finding the measurement of the elementary electronic charge and for his work on the photoelectric effect. He found the mesurement of the charge and mass of a electron using a experiment called the oil drop experiment.
  • Ernest Rutherford

     Ernest Rutherford
    This is Rutherford's later achivement in the atomic feild. He managed to prove that most of an atom is empty space and that the nucleus is ery dense,very small and positively charged. These results were accepted by his gold foil experiment.
  • Henry Gwyn Jeffreys Moseley

     Henry Gwyn Jeffreys Moseley
    He was an English physicist. Using x-ray tubes, he determined the charges on the nuclei of most atoms and is responciple for the deffination of the atomic number of an element.
  • Francis William Aston

     Francis William Aston
    He was a British chemist and physicist. He discovered the existence of isotopes through the use of a mass spectrograph.
  • Niels Henrik David Bohr

    Niels Henrik David Bohr
    He was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory. He made a atomic model that had atoms built up of sucessive orbital shells of electrons.
  • Louis de Broglie

    Louis de Broglie
    1892 -1987
    He was a French physicist who made groundbreaking contributions to quantum theory. He discovered that electrons had a dual nature-similar to both particles and waves. This was called particle/wave duality, which supported Einstein's observations.
  • Werner Karl Heisenberg

    Werner Karl Heisenberg
    He was a German theoretical physicist and one of the key pioneers of quantum mechanics. He described atoms by means of formulas connected to the frequencies of spectral lines. He is also credited with the Principle of Indeterminancy which states that "you can not know both the position and velocity of a particle at the same time".
  • Erwin Rudolf Josef Alexander Schrödinger

    Erwin Rudolf Josef Alexander Schrödinger
    He was a Austrian physicist who developed a number of fundamental results in the field of quantum theory. He was one of the first to view electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
  • Paul Adrien Maurice Dirac

    Paul Adrien Maurice Dirac
    He was an English theoretical physicist who made fundamental contributions to the early development of both quantum mechanics and quantum electrodynamics. Eventhough he didnt find any anti-particles, he was still the first to proposed the idea.
  • James Chadwick

     James Chadwick
    He was an English physicist that is popular for the discovery of the neutron.
  • Glenn Theodore Seaborg

    Glenn Theodore Seaborg
    He was an American scientist who is famous for his involvement in the synthesis, discovery, and investigation of ten transuranium elements. His work in this area also led to his development of the actinide concept and the arrangement of the actinide series in the periodic table of the elements.
  • Enrico Fermi

     Enrico Fermi
    He was an Italian physicist. He is known for his work on Chicago Pile-1, the first nuclear reactor, as well as for his contributions to the development of quantum theory, nuclear and particle physics, and statistical mechanics.