Timeline on the atom

By Isaiah1998
  • Period: to

    Timespan

  • John Dalton's Atomic Theory

    John Dalton's Atomic Theory
    All matter is composed of atoms
    Atoms cannot be made or destroyed
    All atoms of the same element are identical
    Different elements have different types of atoms
    Chemical reactions occur when atoms are rearranged
    Compounds are formed from atoms of the constituent elements.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Arranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic functions of the their atomic weights". This became known as the Periodic Law.

  • James Clerk Maxwell

    James Clerk Maxwell
    Proposed electric and magnetic fields filled the void.

  • G.J Stoney

    G.J Stoney
    Proposed that electricity was made of discrete negative particles he called electrons

  • Hans Geiger and Ernest Marsden

    Hans Geiger and Ernest Marsden
    They scattered alpha particles off a piece of gold foil and observe large angles of scattering, suggesting that atoms have a small, dense, positively charged nucleus.

  • Albert Einstein

    Albert Einstein
    Albert Einstein explains the curvature of space-time.

  • Niehls Bohr

    Niehls Bohr
    Bohr succeeds in constructing a theory of atomic structure based on quantum ideas.

  • Ernest Rutherford

    Ernest Rutherford
    Finds the first evidence for a proton.

  • Arthur Compton

    Arthur Compton
    He discovers the quantum (particle) nature of x rays, thus confirming photons as particles.

  • Louis de Broglie

    Louis de Broglie
    Louis de Broglie proposes that matter has wave properties.

  • Walther Bothe and Hans Geiger

    Walther Bothe and Hans Geiger
    Walther Bothe and Hans Geiger demonstrate that energy and mass are conserved in atomic processes.

  • James Chadwick's Discovery

    James Chadwick's Discovery
    Chadwick discovers the neutron. The mechanisms of nuclear binding and decay become primary problems.

  • Hideki Yukawa

    Hideki Yukawa
    He combines relativity and quantum theory to describe nuclear interactions by an exchange of new particles of mesons called pions. Yukawa concludes that the mass of the particles is about 200 electron masses. This is the beginning of the meson theory of nuclear forces.

  • Enrico Fermi and C.N Yang's Idea on pions

    Enrico Fermi and C.N Yang's Idea on pions
    They suggest that a pion is a composite structure of a nucleon and an anti-nucleon

  • C.N. Yang and Robert Mills

    C.N. Yang and Robert Mills
    C.N. Yang and Robert Mills develop a new class of theories called "gauge theories." This type of theory now forms the basis of the Standard Model.