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C2.1The Periodic Table - Coggle Diagram

- - - - He didn't take into account that other chemists would find new elements.
      - His elements were not organised by similarity
      - Table only works until calcium, then the pattern breaks down
      - Q.1 - Pattern broke down because of undiscovered elements, so not all octaves had similar properties.
- - - - This was the main break through.
    - - He only changed the order when necessary.
      - Q 2.B - At certain places pattern of similar elements recurring at
        regular intervals was broken until the order of atomic weights was reversed.
        There was no good reason for reversing the order so other scientists doubted validity of periodic table.
        After the discovery of the internal structure of the atom, chemists found the atomic number was important in ordering elements not the atomic mas.
        Using the number of protons in atoms to order elements worked perfectly. Anomalies explained by existence of isotopes with different numbers of neutron.
- - - - This sort out the issue of certain elements braking the periodic pattern
      - Organises elements by number of protons (atomic number) and isotopes count (which could change atomic mass).
      - Goes from Hydrogen (1 proton) to Oganesson (118 protons)