Development of the Atomic Structure


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  • 400 BCE
  • Hello, I am Democritus and I proposed that all matter was made of small, hard particles called "atomos" which means indivisible.
  • 1808
  • Hey, I am John Dalton and I created the very first Atomic Theory, I viewed atoms as tiny, solid balls.
  • The Atomic Theory had 4 Statements
  • 1897
  • Greetings! I am JJ Thomson, I discovered in my Cathode Ray Experiment that there are negatively charged particles in the rays. They are called "Corpucles" and later called Electrons.
  • 1911
  • Hello! Ernest Rutherford here, and in my Gold Foil experiment, most of the particles went through while others reflected and scattered.
  • He discovered Protons (which are Positively charged particles) and the Nucleus (center of the atoms). *The number of Protons is the Atomic number of an element
  • 1932
  • Hi there! I am James Chadwick and I discovered Neutrons (which were particles with No Charge)
  • Modern Model - 1932 onward, it is impossible to know where an Electron is at any given time, Bohr orbits replaced by Orbitals.
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