timeline of an atom

By hanksbikes
  • 400 BCE

    Democritus

    Democritus
    Came up with theory that everything in the universe was made out of small tiny things called atoms. Democritus did not conduct any experiments and had very little evidence.
  • 400 BCE

    model of Democritus theory

    model of Democritus theory
  • Period: 400 BCE to

    Timeline of the atomic model

  • John Dalton

    John Dalton
    John Dalton created the threory of atomic weight by calculating the weight of the atoms in a water molecule. His theory was that there was more oxygen than hydrogen in water. His contribution to the atomic model was that all atoms in an element are identical and that atoms of different elements in whole numbers add up as compounds

  • Model of John Dalton's theory

    Model of John Dalton's theory

  • J.J Thompson

    J.J Thompson
    Discovered the electron. He used a high vacuum cathode ray tube to study electrons. His experiment was called the plum pudding model because he had electrons floating around in a positivly charged soup

  • Model of J.J Thompson's experiment

    Model of J.J Thompson's experiment

  • Ernest Rutherford

    Ernest Rutherford
    Ernest Rutherford used the gold foil experiment to prove the modern day atomic model. He found out through the experiment that the positivity charged particles were centralized towards the middle and the electrons or the negatively charged particles were towards the outside of the atom. He also found out atoms are mostly empty space.

  • Rutherfords modern day model

    Rutherfords modern day model

  • Neils Bohr’s Model of the Atom

    Neils Bohr’s Model of the Atom

  • Neil's Bohr

    Neil's Bohr
    Neils Bohr's model explained the Rydberg formula. This was new because Rutherford's model couldn't do this. Bohr's model only worked with the element hydrogen. The model also help lead to defining elements by the amount of electrons they had in there energy levels. Bohr also stated that electrons have fixed paths like the planets in orbit.

  • Erwin Schrödinger’s Quantum Mechanical Model of the Atom

    Erwin Schrödinger’s Quantum Mechanical Model of the Atom

  • Erwin Schrödinger

    Erwin Schrödinger
    Bohr's model was good but not good enough. His model only explained where an electron was on a fixed path. Erwin's model gave the location of the electron. Erwin's model is more of a cloud of where you can find the electron. His model also introduced the idea of sub energy particles. Erwin's Model also stated that electrons can only have certain energy levels.