Atom image

Atom timeline

By Rayyan Zarkani
  • 460

    Democritus

    Democritus
    He developed the concept of the atom means invisible.

  • John Dalton

    John Dalton
    What: Proposed his modern theory of the atom. How: He based it upon :
    1. Matter is made up of atoms that are indivisible and indestructible.
    2. All atoms of an element are identical.
    3. Atoms of different elements have different weights and different chemical properties.
    4. Atoms of different elements combine in simple whole numbers to form compounds.
    5. Atoms cannot be created or destroyed. When a compound decomposes, the atoms are recovered unchanged.

  • JJ Thomson

    JJ Thomson
    He discovered the Plum Pudding Model of the atom.

  • Ernest Rutherfold

    Ernest Rutherfold
    he discovered that theorized that atoms have their positive charge concentrated in a very small nucleus.

  • Niels Bohr

    Niels Bohr
    He present a picture of atom structure