Atomic Theories

By nicolaura
  • 400

    Democritus

    Democritus
    All things are composed of invisible tiny particles of matter, which can’t be destroyed. HERE IS A LINK :)

  • John Dalton

    Described tiny indivisible particles called atoms.
    Atoms can’t be divided or destroyed.
    Atoms can join together to form molecules.
    Atoms of one element are all the same. HERE IS A LINK :)

  • J.J. Thomson

    J.J. Thomson
    Atoms contain electrons, which have a negative charge.
    Atoms are solid with electrons and protons randomly placed through them. HERE IS A LINK :)

  • Ernest Rutherford/Thompson

    Ernest Rutherford/Thompson
    Atoms have a dense nucleus which contains protons, and most of the rest is empty space.
    Electrons orbit around the nucleus like planets around the sun. <a
    href='http://www.newworldencyclopedia.org/entry/Ernest_Rutherford' >HERE IS A LINK :)</a>

  • Niels Bohr

    Niels Bohr
    Electrons are arranged in layers or shells around the nucleus.
    The shells have different energy levels, and electrons fill up the lowest levels first. HERE IS A LINK :)

  • James Chadwick

    James Chadwick
    The nucleus also contains neutrons, which are unchanged particles with a similar mass to protons. HERE IS A LINK :)