History of the atom theory

Timeline created by adiospopo11
In History
  • The Bombarding of Nagasaki and Fukushima

  • Period:
    -460 BCE
    -370 BCE


    Held that everything is composed of ¨atoms¨ which are physically, but not, but not geometrically, indivisible.
  • Period:
    -384 BCE
    -322 BCE


    He thought that all the materials on Earth were not made of atmos, but for the four elements: fire, water, wind, and earth.
  • Period: to


    He was born in France Lavoisier found that mass is conserved in a chemical reaction. The total mass of the products of a chemical reaction is always the same as the total mass of the starting materials consumed in the reaction. His results led to one of the fundamental laws of chemical behavior: the law of conservation of matter, which states that matter is conserved in a chemical reaction.
  • Period: to


    British chemist John Dalton was born in Eaglesfield, England. Atoms of a given element are identical in mass and properties
    Compounds are formed by a combination of two or more different kinds of atoms.
  • Period: to


    He was born in Cheetham Hill, England, Thomson held that atoms are uniform spheres of positively charged matter in which electrons are embedded. Popularly known as the plum pudding model.
  • Period: to


    Max Planck was a German scientist who first discovered that energy is emitted from a black body in discrete amounts called quanta. He showed that the amount of energy was proportional to the frequency of the radiation that was absorbed by the black body, a relationship now known as Planck's Law.
  • Period: to


    He was born in Spring Grove, New Zealand. Rutherford proposed that an atom is composed of empty space mostly with electrons orbiting in a set, predictable paths around fixed, positively charged nucleus. I also discovered the proton.
  • Period: to


    He was born in Copenhagen, Denmark, The Bohr model of the atom, a radical departure from earlier, classical descriptions, was the first that incorporated quantum theory and was the predecessor of wholly quantum-mechanical models.
  • Period: to

    James Chadwick

    James Chadwick bombarded beryllium atoms with alpha particles. Unknown radiation was produced. Chadwick interpreted this radiation as being composed of particles with a neutral electrical charge and the approximate mass of a proton. This particle became known as the neutron. He was born in England.
  • Period: to


    He was born in Würzburg, Germany, contributed to atomic theory through formulating quantum mechanics in terms of matrices and in discovering the uncertainty principle, which states that a particle’s position and momentum cannot both be known exactly.