Periodic table (polyatomic).svg

Developments of the periodic table Laura Shaw

By laurashaw
  • 460

    Position of Atoms

    Position of Atoms
    Democritus established basis for Atoms.
  • Sep 1, 600

    Amber

    Amber
    Thales of Miletus, discovered amber by rubbing soft object against it.

  • Reconised atom

    Was the year that the first scientifically recognized atom was discovered this atom was phosphorous.

  • Tellurium

    Tellurium
    Franz-Joseph Müller von Reichenstein discovered Tellurium

  • Collating elements

    Collating elements
    Dmitri Mendeleev discovered a way of collating the elements, The system was in the order of Atomic weight, then position into rows and columns sourced on there chemical and physical properties.

  • Argon

    The gas Argon was discovered by Lord Rayleigh.

  • The structure

    The structure
    J.J Thomson discovered the structure of the atom.

  • Electrons

    Electrons
    The successful scientest J.J Thomson discovered the electrons that live in an atom.

  • Change to periodic table

    Mosely found that the periodic table would be better if it was ordered by atomic number instead of atomic weight.

  • Neutron

    Neutron
    James chadwick discovered the neutron in the atom.

  • First Nuclear reactor

    Man made nuclear reactor was developed by Enrico Fermi.