Friday 5th September
TODAY WE ARE
LEARNING ABOUT
 How was the periodic table developed?
TODAY'S
KEY WORDS ARE
  • p_tt_rn
  • n_n-m_t_l
  • m_t_ls
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    Memory Anchor:

    YOU WILL SHOW
    YOUR LEARNING BY...

    • Super Challenge:

      Stretch:

      Challenge:

    Key Questions:

    1. How were elements in early periodic tables ordered?
      • By atomic mass
    2. Why were early attempts at ordering the periodic table by atomic mass unsuccessful?
      • As this caused certain elements to be incorrectly placed in groups with elements with very different propertiesno.
    3. How did Mendeleev predict the existence of several undiscovered elements when designing his periodic table?
      • He identified where there was no existing element that fit the pattern of his periodic table, so left gaps in for them.
    4. How are metals and non-metal elements arranged on the periodic table
      • Metals are found to the left and towards the bottom of the periodic table. Non-metals are found towards the right and top of the periodic table.
    5. What steps were involved in the development of the periodic table?
      • 1. Groups of three elements with similar properties called triads. 2. More accurate atomic weights 3. Newlands table in atomic weight (law of octaves) 4. Mendeleev who left gaps putting them in groups with similar properties