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Atomic Structure

By Chelsea_Mowery
  • 400

    "The Four Elements"

    "The Four Elements"
    Aristotle Aristotle believed all matter was made of "The Four Elements".
    1) Fire
    2) Earth
    3) Air
    4) Water He didn't have any proof to support his theory. Although, people still believed and supported him becaue at that time Aristotle was one of the greatest minds.
  • 400

    Democritus

    Democritus
    Democritus Atomic Theory Democritus come up with the theory stating that matter could not be divided into smaller and smaller pieces forever, eventually the smallest possible piece would be obtained. This piece would be indivisible. He named the smallest piece of matter “atomos,” meaning “not to be cut.”

  • John Dalton

    John Dalton
    Dalton's Theory John Dalton proposed an "atomic theory" with sphere shaped, solid atoms based on the properties of mass. 1) All matter is made of atoms. Atoms are indivisible and indestructible.
    2) All atoms of a given element are identical in mass and properties
    3) Compounds are formed by a combination of two or more different kinds of atoms.
    4) A chemical reaction is a rearrangement of atoms.

  • Thallium

    Thallium
    Sir William Crookes Sir William Crookes discovered the element Thallium. He is also known for his cathode-ray studies.

  • Sir Joseph John Thomson

    Sir Joseph John Thomson
    J. J. Thomson Sir Joseph John Thomson discovered the electron in a series of experiments designed to study the nature of electric discharge in a high-vaccum cathode-ray tube.

  • Pierre and Marie Curie

    Pierre and Marie Curie
    The Curies discovered polonium (Po) and Radium (Ra).

  • High Velocity Atom

    High Velocity Atom
    Ritherford proved that atoms of one radioactive element would turn into another, by expelling a piece of the atom at high velocity.

  • Fixing Mistakes

    Fixing Mistakes
    Niels Henrik David Bohr proposed adding to the Bohr model to fix mistakes.

  • Radioactive element.

    Radioactive element.
    recognition of Ernest Rutherford for the radioactive element

  • Electron Charge

    Electron Charge
    Millikan determined the electric charge carried by a single electron.

  • Atomic Nucleus/ Atomic Model

    Atomic Nucleus/ Atomic Model
    Erenst Rutherford discovered the atomic nucleus and developed a model of the atom.

  • Systematic Reaction

    Systematic Reaction
    Henry Moseley discovered the systematic reaction between wavelength and atomic number

  • Death of Henry Moseley

    Death of Henry Moseley
    Moseley was shot dead during the Battle of Gallipolli in Turkey.

  • Photoelectric Effect

    Photoelectric Effect
    Robert Andrews Millikan designed the photoelectric effect (Albert Einstein).

  • Nobel Prize

    Nobel Prize
    Bohr's proposal was correct , he recieved the Nobel Prize for his work.