Group 7

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    Created by
    anushka mekala

    Cards (19)

    • Atomic radius increases down the group
      more shells
      more shielding
      weaker attraction between nucleus and outer e
    • boiling point increases down the group
      become less volatile
      as they get larger
      more e
      stronger van der waals
    • electronegativity decreases down the group
      more shells
      similar shielding
      weaker attraction between nucleus and pair of e in covalent bond is less
    • first ionisation decreases down the group
      more shells
      more shielding
      weaker attraction between nucleus and outer e
      less energy to remove
    • iodine and cyclohexane ..
      pink purple
    • colour of cl2 at room temp

      pale green
    • br2 at room temp
      orange
    • I2 at room temp
      brown
    • oxidising agent
      gain/accepst electrons
    • halogens act as a oxidizing agent ..down the group
      decreases
      more shells
      more shielding
      weaker attraction between nucleus and outer e
      less ability to act as a oxidizing agent
    • test for halide ions
      add dilute nitric acid
      add silver nitrate
    • results of halide ions
      cl white
      br cream
      i yellow
    • silver halides with dilute ammonia
      cl - dissolves
      br insoluble
      i - insoluble
    • silver halides with conc ammonia
      cl - dissolves
      br - dissolves
      I - insoluble
    • silver halide and excess ammonia - silver and ammonia comples ion and halide ion
    • Halides act as a reducing agent
    • sulfuric acid and halides
      steamy white fumes
    • SO2 is a choking gas
      S is yellow solid
      H2S bad egg smell
    • halides reducing strength increases as you go down the group
      more shells
      more shielding
      e being donated is less attracted to nucleus
      more easily donated