Atomic Structure


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  • When I performed the Cathode Ray Experiment, I discovered the negative charges, I originally called them corpuscles but I later changed the name into Electrons. Therefore in 1897, J.J. Thomson discovered the electrons.
  • When I performed the Gold Foil Experiment, I can observe that some particle pass through and some don't. This predicts that somehow a positive charge can deflect some particles and an empty space allows some particles to pass through. The positive charges inside a nucleus is called a proton. Furthermore, in 1910 this experiment by Ernest Rutherford led to the discovery of protons and the nucleus.
  • In 1932, a scientist named as James Chadwick conducted an experiment with alpha particles and made it pass through the element Beryllium (Be) then suddenly the alpha particle lost its charge. He called this non-charged particles, neutrons. I therefore conclude that, in 1932, James Chadwick discovered the neutrons through an alpha particle experimentation.
  • I, John Dalton, will determine a relative mass for the atoms of the elements.
  • What if I, Dimitri Mendeleev, arrange these elements into one table. (This table is currently known as the Periodic Table of Elements).
  • Its already 1913, I think I, Henry Moseley should rearrange these elements according to their atomic number. Hence, the atomic number was discovered in 1913 by Henry Moseley
  • For the Isotope Notation : A = Mass Number Z = Atomic Number and Number of Protons X = Chemical Symbol for an Element
  • Now I, Miguel Dy, will share my prior knowledge to the atomic structure and isotope notation.
  • To end this presentation, all I can say that is there might be new particles discovered in the future and I have learned that the atomic structure has developed throughout the years
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