The Atom Over the Years

By NicoleF
  • 400

    The Atom (atomos)

    The Atom (atomos)
    Ancient Greek Philosophers were among the first to discover that if you continuously cut something up to reduce its size, eventually it can't be cut anymore. They named this miniscule object 'atomos' meaning 'that which is invisible'.
  • Period: Mar 1, 1500 to

    Little Advancement

    Many theories scientists had about atoms were being diesregarded in this timespan, so as a result, little advancement was made in the study of atoms.
  • Daltons Discoveries

    Daltons Discoveries
    One of John Dalton's (a British Chemisist) most famous theories was that each element is composed of many atoms. Also, he believed that each element had atoms with different masses.
  • Thomsons Discoveries

    Thomsons Discoveries
    J.J Thomson (a British scientist) discovered a very important component of the atom. The electron. Later on, he updated his model of the atom to infer that it was really a sphere positively charged with electrons all along it.
  • Nagaokas Discoveries

    Nagaokas Discoveries
    Hantaro Nagaoka (a Japanese physisist) created a model of the atom that is described as a large, positively charged sphere with electrons rapidly rotating around it.
  • Rutherfords Discoveries

    Rutherfords Discoveries
    Ernest Rutherford (a British physisist) decided that an atom is probably made up of empty space. With a nucleus at the center, negatively charged electrons chaotically revolve around it.
  • Bohrs Discoveries

    Bohrs Discoveries
    Niels Boehr (a Danish physisist) proposed a different looking model than the previous, where electrons moved in specific layers, never randomly. He infered that atoms absorb and/or give off energy when the elctrons switch layers.
  • Chadwicks Discoveries

    Chadwicks Discoveries
    James Chadwick (a British physisist) discovered another important part of the atom. No, not the electron... the neutron! Neutron's entire existence showed why atoms could be heavier than the combined mass of their electrons and protons.
  • The Atom we Know

    The Atom we Know
    All the work done over the years has to contributed to our view of the modern atom. Now, we know that Electrons are like a negatively charged cloud, bouncing around the nucleus. Right now, it is impossible to predict where an atom is or will be at any moment.