Atom editor logo.svg

Atom Timeline

  • Dalton: Solid Sphere Model

    Dalton: Solid Sphere Model
    Dalton's model of the atom (ESAAO) John Dalton proposed that all matter is composed of very small things which he called atoms. This was not a completely new concept as the ancient Greeks (notably Democritus) had proposed that all matter is composed of small, indivisible (cannot be divided) objects
  • Thompson: The Plum Pudding Model

    Thompson: The Plum Pudding Model
    The Plum Pudding Model is a model of atomic structure proposed by J.J. Thomson in the late 19th century. Thomson had discovered that atoms are composite objects, made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom.
  • Rutherford: The Nuclear Model

    Rutherford: The Nuclear Model
    Rutherford overturned Thomson's model in 1911 with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus. Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure.
  • Bohr: The Bohr (Planetary) Mode

    Bohr: The Bohr (Planetary) Mode
    Niels Bohr proposed the Bohr Model of the Atom in 1915. ... The Bohr Model is a planetary model in which the negatively-charged electrons orbit a small, positively-charged nucleus similar to the planets orbiting the Sun (except that the orbits are not planar
  • Schrodinger: Quantum Mechanical Model

    Schrodinger: Quantum Mechanical Model
    n 1926 Erwin Schrödinger, an Austrian physicist, took the Bohr atom model one step further. Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom.
  • Higg Boson

    Higg Boson
    The Higgs boson is an elementary particle in the Standard Model of particle physics, produced by the quantum excitation of the Higgs field, one of the fields in particle physics theory.