Giphy

Ruthvi Shah

By psharmaims
  • 460

    Democritus

    Democritus
    Democritus was a greek philosopher who proposed the idea, that matter is made of tiny indivisible, indestructible particles that he called atomos. He did not have any equipment or tools to test his idea. Eventually, his ideas were rejected.

  • John Dalton

    John Dalton
    John Dalton's theory is called, " Dalton's Atomic Theory." He discovered that all matter is made up of atoms. All atoms of a given element are identical in mass and properties. John Dalton also discovered that all compounds are formed by the combination of two or more atoms. Lastly, he discovered that a chemical reaction is a rearrangement of atoms.

  • J.J Thompson

    J.J Thompson
    J.J Thompson's theory discovered the electron. Thompson worked with gas discharge tubes in this experiment. He discovered that the electron's charge is negative. He discovered that electrons move from the negative end of the tube to the positive end because the opposite electrons attract. Thompson also uncovered the Cathode rays. He also learned that the cathode rays were made of negatively charged particles or electrons.

  • Lord Ernest Rutherford

    Lord Ernest Rutherford
    Rutherford conducted a famous experiment called the gold foil experiment. He used a thin sheet of gold foil and equipment to shoot alpha particles. Most particles passed through the foil and some particles were deflected. From his experiment he learned that the positively charged nucleus repels the positive alpha particles because opposite particles attract and the same ones don't. Ernest Rutherford also discovered that atoms are mostly empty space because most particles passed through the foil.

  • Niels Bohr

    Niels Bohr
    Niels Bohr was a Danish physicist who proposed a model of the atom, similar to the solar system. In the experiment, the electrons circulated the nucleus. The models had rings or shells.He learned that each shell or ring can hold a certain amount of electrons. He also learned that the energy of the electrons goes up from level one to other levels. When electrons release energy, they go down a level. When electrons absorb or gain energy, they go to a higher level.