History of the Atom

  • Birth of John Dalton

    Birth of John Dalton
    6 September 1766 was the birth of John Dalton
  • Dalton's atomic theory

    It was in the early 1800s that John Dalton came up with his atomic theory and five points to it: o Elements are made of extremely small particles called atoms.
    o Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
    o Atoms cannot be subdivided, created, or destroyed.
    o Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
    o In chemical reactions, atoms are combin
  • Death of John Dalton

    27 July 1844 was the date John Dalton died
  • J.J Thomson was born

    J.J Thomson was born
    18 December 1856 J.J Thompson was born
  • Ernest Rutherford was born

    Ernest Rutherford was born
    30 August 1871 was the date of birth for Ernest Rutherford
  • Niels Bohr was born

    Niels Bohr was born
    7 October 1885 Bohr was born
  • Erwin Schrodinger born

    12 August 1887 was the date of birth of Erwin Schrodinger
  • James Chadwick was born

    James Chadwick was born
    James Chadwick was born on 20 October 1891
  • Werner Heisenberg was born

    Werner Heisenberg was born
    5 December 1901 was the date Heisenberg was born
  • Thomson discovered the natural radioactivity of potassium

    In 1905 Thomson discovered the natural radioactivity of potassium
  • Thomson demonstrated hydrogen had only a single electron per atom.

    In 1906 Thomson demonstrated that hydrogen had only a single electron per atom. Previous theories allowed various numbers of electrons
  • Thomson awarded Nobel Prize in Physics for the discovery of electrons

    Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases.
  • Ernest Rutherford was awarded with a Nobel Prize in Chemisrty

    He was awarded in 1908 "for his investigations into the disintegration of the elements, and the chemistry of radioactive substances".
  • Geiger–Marsden experiment

    Along with Hans Geiger and Ernest Marsden, Rutherford carried out the Geiger–Marsden experiment, which demonstrated the nuclear nature of atoms
  • Rutherford model of the atom

    He theorized that atoms have their positive charge concentrated in a very small nucleus, and thereby pioneered the Rutherford model of the atom, through his discovery and interpretation of Rutherford scattering in his gold foil experiment.
  • Bohr and Rutherford work together

    In 1912 he met and later joined Ernest Rutherford at Manchester University, where on and off he spent four fruitful years in association with the older physics professor.
  • Bohr published his model of atomic structure

    Bohr published his model of atomic structure
    Here he introduced the theory of electrons traveling in orbits around the atom's nucleus, the chemical properties of each element being largely determined by the number of electrons in the outer orbits of its atoms.Bohr also introduced the idea that an electron could drop from a higher-energy orbit to a lower one, in the process emitting a photon (light quantum) of discrete energy. This became a basis for quantum theory.
  • Bohr becomes chair of theoretical physics

    In 1916, Bohr returned permanently to the University of Copenhagen, where he was appointed to the Chair of Theoretical Physics, a position created especially for him
  • Rutherford's split of the atom

    He is widely credited with first "splitting the atom" in a nuclear reaction between nitrogen and alpha particles, in which he also discoveredthe proton.
  • Bohr founded the Institute of Theoretical Physics

    he succeeded in founding the Institute of Theoretical Physics in
  • Bohr recieves Nobel Prize in Physics

    Bohr made foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922.
  • Schrödinger equation

    Schrödinger published a paper on wave mechanics and what is now known as the Schrödinger equation.
  • Werner Heisenberg worked with Bohr

    Werner Heisenberg worked as an assistant to Bohr and university lecturer in Copenhagen from 1926 to 1927
  • Murray Gell-Mann born

    Murray Gell-Mann born
    Born September 15, 1929
  • Heisenberg was awarded with a Nobel Prize in Physics

    Heisenberg was awarded the 1932 Nobel Prize in Physics for the creation of quantum mechanics, and its application especially to the discovery of the allotropic forms of hydrogen
  • Chadwick awarded for discovering neutron

    Chadwick was awarded for his discovery of the neutron in 1932
  • Rutherford's death

    19 October 1937 was the death of Rutherford
  • Death of J.J Thomson

    30 August 1940 was the death of J.J Thomson
  • Bohr recieves the Atoms for Peace Award

    Received the first ever Atoms for Peace Award in 1957.
  • Erwin Schrodinger died

    Death of Erwin Schrodinger on 4 January 1961
  • Death of Niels Bohr

    18 November 1962 Niels Bohr passes away.
  • Murray Gell-Mann recieves Nobel Prize in Physics

    He was awarded a Nobel Prize in physics in 1969 for his contributions and discoveries concerning the classification of elementary particles and their interactions.
  • James Chadwick died

    James Chadwick died on 24 July 1974
  • Werner Heisenberg's death

    1 February 1976 was the date of Werner Heisenberg's death