Trends within the Periodic Table

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  • Trends within the Periodic Table
    • Group 1          (Alkali Metals)
      • Metals with LOW density. First 3 are less dense than water
      • Reacts with non-metals to form an ion bond
        • Where the group 1 ion carries a +1 charge
          • The compounds are white solids that dissolve in water to form COLOURLESS solutions
      • React with water to release HYDROGEN
      • Form hydroxides that dissolve in water to give ALKALINE SOLUTIONS
      • Further down you go:
        • The more reactive they become
        • The lower their melting and boiling points
    • Group 7  (Halogens)
      • React with metals to form an ionic compound
        • In which the halide ion carries a charge of -1
      • More reactive halogen can displace a less reactive halogen from an aqueous solution of its salt
      • Further down you go:
        • The elements become less reactive
        • Have a higher melting and boiling point
    • Compared with Group 1, Transition elements:
      • Have higher melting point (except mercury)
      • Have higher density
      • Are stronger and harder
      • Much less reactive. Don't react as vigorously with oxygen and water
    • Trends can be explained because
      • The higher the energy level of the outer electrons:
        • More easily electrons are lost
        • Less easily electrons are gained


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