Alex Woodhouse

  • 322


    His idea conflicted with Democritus' theory and said that everything is made of elements. This was believed for over 2,000 years.He studied under Plato from 367 B.C. to 347 B.C.and later tutored Alexander the Great at the Macedonian court from 342 B.C. to 399 B.C.
  • 370


    Democritus theorised that everything is made of atoms.
  • John Dalton

    John Dalton
    Daltons 5 postulates(Dalton’s Atomic Theory):
    All matter consists of tiny particles.
    Atoms are indestructible and unchangeable.
    Elements are characterized by the mass of their atoms.
    When elements react, their atoms combine in simple, whole number ratios.
    When elements react, their atoms sometimes combine in more than one simple, whole number ratio.
  • Crooke

    the development of a better vacuum pump that allowed him to make cathode-ray tubes with a smaller gas pressure.
  • John Newlands

    John Newlands
    The law of octaves says if the chemical elements are arranged according to increasing atomic weight, the ones that have similar physical and chemical properties happen after each interval of seven elements.
  • Mendeleev

    He organized the periodic table by the molecular weights of the elements and by their properties.
  • Rutherford

    descovered the nucleus. known as "Father of Physics"
  • JJ Thomson

    Descovered the electron
  • Bohr

    Quantum theory of Matter. Nobel prize