History of the Atom Timeline

By reezy/brock
  • 460

    Democritus

    Democritus
    History of Atoms." History of Atoms. N.p., n.d. Web. 06 Mar. 2014.In 460 B.C. he discovered the grouping of atoms make up different things in the world. The way it added to the previous model of the atom by atoms size,weight/mass, and shape. The method he used to make his discovery was theory of atomism :everything in the universe is made up of tiny indicisible parts. He thought that atoms looked like tiny peices of matter and grouping of atoms show an 'image' that is thin outer layer of atoms.
  • Mar 7, 700

    Aristotle

    Aristotle
    "A Brief History of Modern Atomic Theory." Chemistry Tutorial : History ofIn 700 B.C. he made the discovery.The atomic ideas of Democritus had no easting effect on aristotle. The method that he used to discover it was matter must be made of small pieces. The atoms looked like small tiny particles.

  • Dalton

    Dalton
    "World Book Online Reference Center | Online Reference Book| Online Encyclopedia."First to say everything in the world is made of atoms. The method that he used to discover it is he performed experiments with various chemicals that showed that matter seemed to consist of elementary lumpy particles (atoms) Daltons Law: various elements contained different ratios of atoms. He thought the atoms looked like small, silver sphere.

  • Thompson

    Thompson
    "Joseph John Thomson." Homepage of the Chemical Heritage Foundation. N.p., n.dHe studied "coral rays" and found that they were associated with the protons Ht. The method that he used to discover it is he used a CRT to expenmentary determinethe charge to mass ratio of an electrons. He thought they looked like "Rasin in the Pudding" model.

  • Rutherford

    Rutherford
    Rutherford - Atomic Theory." Rutherford - Atomic Theory. N.p., n.d. Web. 04 MarHe studied radiations entitled from uranium and thorium and named them alpha and beta. Discovered the nucleus was very dense, very small, and positively charged. The method that he used to discover it is he used alpha particles as atomic bullets. The atoms looked like electrons were located outside the nucleus. Showed that the ato consisted of an extremely small.positively charged nucleus,negativley charged electrons writing around the nucleus.

  • Bohr

    Bohr
    Bohr Model." Chemistry. N.p., n.d. Web. 06 Mar. 2014Developed an explanation of atomic strucure that landelies requantes of the periodic tables of elements. The method that he used was his theory was based on Rutherford's.Electrons could travel in only certain sucessesly large orbits around in the nucleus. He thought that the outer orbits could hold more elements in the inner one. He thought the atom looked like his atomic model had atoms bulit up off successive orbital shells of electrons.

  • Heisenberg

    Heisenberg
    Modern Atomic Theory." Modern Atomic Theory. N.p., n.d. Web. 06 Mar. 2014.He deals with subatomic particles (smaller pieces that make up atoms.) Formed his thoery about atomic structure by studying light given off atoms. The method that he used was described atoms by means of formula connected to the frequencies of spiral lines. Studied the spectra guin off by atoms. He thought they looked like quantrum mechanics - new. Physics of the atom wored.

  • Schrodinger

    Schrodinger
    "Electron Arrangement and Schrodinger's Atomic Model." Electron Arrangement and Schrodinger's Atomic Model. N.p., n.d. Web. 06 Mar. 2014.Expands Alberts theory of grantation to include electrical and magnetic phenomena. Mixed science and philosophy. The method that he used to discover it is he introduced "wase mechanics" as a mathmatical model of a atom. Developed the equation schrodinger equation. He viewed electrons as continuous clouds. "Wase Mechanics."