Chemistry 3: History and Modern Periodic Table

GCSE AQA Chemistry 3, The Periodic Table. History and Modern.



Breif Revision Notes.

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  • Created by: Liam
  • Created on: 07-02-13 17:54
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  • C3: The Periodic Table
    • The Modern Periodic Table
      • When proton, neutrons and electrons were discoverd, in the late 19th century,  the table was arranged in order of atomic number
      • The elements can be seen as being arranged by their electronic structure.
      • The electrons are set out in shells, which each correspond to an energy level
      • The group number is equal to the number of electrons in the highest occupied shell. E.g. Group 4 has 4 electrons in its outer shell
      • Reactivity increases going down group 1.The energy of 1 electron in the outer shell
      • Reactivity decreasses going down group 7. The energy of 7 electrons in the outer shell.
    • Hisotry Of The Periodoc Table
      • Newlands
        • First Person to try and arrange elements
        • Created Law of Octave
          • Broke down after calcium
        • His work was ignored beacuse >
          • His groups didnt have similar properties
          • Mixed metals and non-metals
          • Did not leave any gaps.
      • Medleev
        • Arranged the elements in order of atomic mass
        • Left gaps to keep elements with similar properties in the same groups
        • The gaps predicted the properties of so far undiscoverd elements
          • When they were found, they fitted the pattern
      • In the 1800s, they could only go on physical apperence and, relative atomic mass and chemical properties. No idea of protons, neutrons.


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