History of the Atom Timeline by Taliyah Anthony

By ta4280
  • 400

    Aristotle BC

    Aristotle BC
    He didn't believe in the atomic theory,he only believed in the "The Four Element".Had no proof.
  • 450

    Democritus bc

    Democritus bc
    He discovered that everything is composed of "atoms" which are phisically , but not geomectrically ,indivisible that between atoms, there lies empty space.Atoms are indestructible, they remain unchanged.His method was he created the idea "That if you break a piece of matter in half ,and break it in half agin, how many breaks will you have to make before you can break it no further?"He thought the atom looked like a marble.

  • Dalton

    Dalton
    He discovered that eaach elment is composed of it's own kind of atoms,all with the same relative weight.He used microscopic experiements to make his discovery.He bileved the atom looked like a marble.

  • Thomson

    Thomson
    He discovered the electron.He suggested that the atom is not indivisible as it was of smaller pieces - elecrons and protons.The famous name for his moel was callled "The Plum Pudding"

  • Rutherford

    Rutherford
    He discovered that an atom must have almost al it's mass concontrated at it's center, in a nucleus,with the vast majority of the atom consisting of empty space.iN 1909 with 2 other scientist w,which they studied the deflection angles of "alpha particles" that they shot through a microscopically thin layer of gold.Alpha particles are just helium atoms stripped of their 2 electrons.He called it the Plantary model because electrons orbit the nucleus like planetsaround the sun.

  • Bohr

    Bohr
    Proposed that electrons orbit he nucleus without losing energy,could move nly in fixed orbits of specific energies,Electorns with low energy would orbit closer to the nucleus while electrons with high energy would orbit further from the nuclus.He used Ernest Rutherford's therory and aided it to make his discovery.

  • Heisenberg and Schrodinger

    Heisenberg and Schrodinger
    He made this discovery by hitting electronswith gamma rays would alter the electron's behavior.And that you could measure the position of an electron (or other particles) or you could mesure it's momentum.His method was hitting electrons with gamma rays.The famouse name for his model is Uncertainty Principle (name of equation).