Chemistry word

Chemical Discoveries

By emilystrange
  • 460 BCE

    Democritus proposes the first idea of the atom

    Democritus proposes the first idea of the atom
    • "atom" from the greek word "atoma" means undivided -Democritus came to the conclusion that there matter is made up of tiny spheres that can not be broken any further.

  • Edward Jenner creates smallpox vaccine

    Edward Jenner creates smallpox vaccine
    -smallpox used to kill many
    -discovered that being infected with cowpox protects against smallpox
    -creates and calls this a vaccine
    -word "vaccine" comes from "vaccine" in Latin, which means cowpox

  • Dalton develops atomic theory

    Dalton develops atomic theory
    1. Suggested that all matter was made up of tiny spheres (atoms)
    2. Atoms in a given substance are the same in size and shape
    3. Atoms of different elements can be combined to make different compounds.
    4. Atoms themselves cannot change to form different elements -Billiard Ball Model - envisioned atoms as "solid" and used wooden balls to model them

  • Rutherford discoveries the source of radioactivity

    Rutherford discoveries the source of radioactivity
    • found neutral, central nucleus with protons
    • Gold Foil Experiment - observed the effect of alpha particles on matter

  • Neil Bohr proposes the Bohr Model of the atom

    Neil Bohr proposes the Bohr Model of the atom
    • furthered Rutherford's theory
    • added that electrons were in a 2D orbit -fixed amount of electrons