History of the Atom

  • Laviosier

    He provided the formula for the conservation of matter in chemical reactions.
  • Coulomb

    Formulated the Coulomb's law which talks about one of the main forces involved in atomic reactions.
  • Dalton

    He formed the atomic theory
  • Michael Faraday

    Michael Faraday
    Discovered Electrolysis which is the splitting of atoms with electricity.
  • Dmitri Mendeleeff

    Dmitri Mendeleeff
    He discovered the periodic law which states that the properties of the elemnts are periodic functions of their atomic weights.
  • G.J. Stoney

    G.J. Stoney
    Discovered electricity were made of negativily charged particles called electrons.
  • Wilhelm Roentgen

    Wilhelm Roentgen
    Discovered X-Rays
  • Frederick Soddy

    Frederick Soddy
    Discovered isotopes and half-life
  • Hantaro Nagoaka

    Hantaro Nagoaka
    Depicted a model of the atom with flat rings of electrons revolvong around a positively charged particle.
  • Heins Geiger

    Heins Geiger
    Invented a device to make noise when it located alpha particles.
  • R.A. Millikan

    R.A. Millikan
    He had an oil drop test that determined an electrons charge and mass.
  • Ernest Rutherford

    Ernest Rutherford
    Discoverd using alpha particles as atomic bullets that the atoms nucleus is small, dense, and positively charged. And that electrons were outside of the nucleus.
  • H.G.J. Moseley

    H.G.J. Moseley
    He said that the atomic number of an element is equal to the number of protons in the nucleus.
  • Niels Bohr

    Niels Bohr
    Discovered an explenation of the atomic structure. His atomic model had atoms built up of sucessive orbital shells of electrons.
  • James Chadwick

    James Chadwick
    He used alpha particles to discover a neutral atomic particle with a mass that is similar to a proton. That led to his discovery of the neutron.