Periodic table and reactions summary

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  • Periodic table chapter summary
    • Periodic trends
      • First ionisation energies and radii
        • Across a period
          • 1) Number of protons increase
          • 2) First ionisation energy increases
          • 3) Atomic radius decreases
        • Down a group
          • 1) Shells increase
          • 2) Shielding increases as  does atomic radii
          • 3) First ionisation energy decreases
      • Melting and boiling points
        • Giant metallic lattice
          • Increase in boiling and melting points from Li to B for example
          • Elements in the 3rd group have more electrons so the metallic bond has a stronger attraction between the delocalised electrons and ions.
        • Giant covalent lattice
          • Decrease in melting/boiling points across the period
          • Less covalent bonds able to made as you go across
        • Simple molecular lattice
          • Low melting and boiling points
          • Weak van der walls between molecules easy to break as only formed from dipole interactions
    • Groups
      • Group 2
      • Group 7
        • Disproportionation
          • When an element (Cl2) is both reduced and oxidised in a reaction
        • Reactivity
          • Decreases down group
          • Displacement
          • As you go down the group increased can der waals occur
            • Due to more electrons so more likely to be unevenly distributed

Comments

hana bieber


thanks soo much its helped really much

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