Atomicman

Harsh Patel

By psharmaims
  • 400 BCE

    Democritus

    Democritus
    Democritus was a Greek philosopher. He proposed that matter is made of atomos. Atomos are tiny, indestructible, and indivisible particles. Although it was rejected because he did not have the proper equipment to prove his ideas.
    Fun fact: The English word atom comes for the greek word atomos
  • Period: 400 BCE to

    Timeline

    A timeline by Harsh Patel

  • John Dalton

    John Dalton
    John Dalton was a English chemist. He used his ideas to make the atomic theory of matter. His ideas were: 1) Atoms are made up of atoms. Its's impossible to destroy or divide and atom
    2)Every atom of the same element are similar
    3)The atoms of a different atom are different
    4)Atoms of different elements combine to for compounds.

  • J. J. Thompson

    J. J. Thompson
    J. J. Thompson was an English scientist. While he was experimenting with gas discharge tubes he discover the electron. During the experiment he saw something moving in the tube. He called what was moving in the tube cathode rays. He also saw that the rays were moving from the negative end of the tube to the positive end. He had realized that the rays were made from a negatively charged particle called the electron.

  • Niels Bohr

    Bohr was a Danish physicist. He had proposed a model of an atom that is pretty similar to the solar system because the electrons orbit the nucleus. The electrons have specific energy levels. Level 1: holds 2 electrons Level 2: holds 8 electrons
    Level 3: holds 18 electron Level 4:: holds 32 electrons. Every electron has an energy level. It is the difference between electrons in the same atom. When an electron gains energy it go's up a level , but when it loses energy it goes down a level

  • Lord Ernest Rutherford

    Lord Ernest Rutherford
    Rutherford had conducted the famous gold foil experiment. He had used a special machine to shoot alpha particles at the foil. When he did the experiment he noticed that some particle went through while others didn't.
    His observations are: 1)Atoms are made of a small positive nucleus.A positive nucleus repels or pushes away positive alpha particles.
    2)Atoms are mostly empty space.