Contributors to the Atomic Theory

By manderson1221
  • 465 BCE

    Democritus

    He was the inventor of the atomic theory.
  • 340 BCE

    Aristotle

    Aristotle discovered elements, this was the start of something that would later become the Periodic Table of Elements.
  • 49 BCE

    Thales of Miletus

    He came up with the theory that all matter is composed f particles called atoms.

  • Sir William Gilbert

    He contributed theories on magnetism

  • Isaac Newton

    Atoms could move and cause things to move

  • John Dalton

    Atoms were just solid spheres in which they come together to build things.

  • Antoine Lavoisier

    Qualitative to a quantitattive one

  • Sir Humphry Davy

    Davy discovered 6 new elements that helped contribute to the Periodic Table of Elements.

  • Joseph Proust

    Law of definite proportions

  • MIchael Faraday

    Faraday developed the laws of electrolysis.

  • Dmitri Mendeleev

    He came up with the first design or drawing of the Periodical Table of Elements.

  • Max Planck

    The founder of the Quantum Theory

  • J. Plucker

    The first to identify and experiment with what were actually electron rays prod used in vacuum.

  • Hantaro Nagaoka

    That an atom has a nucleus.

  • Ernest Rutherford

    An atom has a dense positively charged nucleus with electrons floating randomly around the nucleus its self.

  • Niels Bohr

    The electrons in an atom move in spherical orbits around the nucleus.

  • E. Goldstein

    Discovered protons.

  • Schrodinger

    Developed mathematical equations that describes the motion of an atom.

  • James Chadwick

    Confirmed that an atom had electrons but they are not charged.

  • Louis de Broglie

    Moving particles in an atom like electrons have some properties of waves.

  • G.J. Stoney

    G.J. Stoney wrote the letter titled "Elements". Many of his theories in this letter contributed to the atomic theory.

  • Wilhelm Roentgen

    Roentgen discovered x-rays and how they worked.

  • Henri Becquerel

    Becquerel discovered radioactivity that consisted of atoms.

  • Marie Curie

    She discovered two radioactive elements, polonium and radium.

  • Frederick Soddy

    Soddy observed spontaneous disintegration of radioactive elements into isotopes.

  • Sir William Crookes

    Crookes discovered the element thallium. This element soon became apart of the Periodic Table of Elements.

  • Richard Abegg

    Abegg proposed the valance theory and his theory of freezing-point depression. He also discovered that inert gases had a stable electron configuration.

  • Albert Einstein

    Einstein's special theory of reactivity helped the law of mechanics and laws of the electromagnetic field. He also helped establish the photon theory of light.

  • Hans Geiger

    Geiger invented the Geiger counter to measure radiation.

  • Henry Moseley

    Moseley's theory that the relationship between x-rays was a function of the positive charge on the nucleus helped the Atomic Theory.

  • Francis William Aston

    Aston discovered the idea that modern atomic masses are based on mass spectral analysis.

  • Wolfgang Pauli

    Pauli invented the Pauli Exclusion Principle that states no two electrons can exist in the same quantum state.

  • Werner Heisenberg

    Heisenberg discover a way to formulate quantum mechanics in terms of matrices.

  • John Cockcroft / Ernest Walton

    While conducting "atom-smashing" experiments, Cockcroft and Walton split the atom.

  • Paul Dirac

    Dirac discovered new productive forms of the atomic theory. He created the Dirac Equation in 1928. It describes the behavior of fermions like the electron, and predicted the existence of antimatter such as the positron