Group 7

HideShow resource information
  • Created by: emma
  • Created on: 22-03-14 21:39
View mindmap
  • Group 7
    • Atomic radius
      • Increases as electrons are added to shells further from nucleus and more sheilding
    • Boiling and Melting points
      • Increases down group
        • Larger molecules and more electrons so greater van der waals between molecules
    • Electronegativity
      • The ability of an atom to attract a shared pair of electrons
      • Decreases down group
        • more shells of electrons so more shielding and further from nucleus
          • Less electrostatic force of attraction between outer electron and nucleus
    • Physical properties
      • F pale yellow gas, reacts with water
      • Cl green gas, pale green solution
      • Bromine dark red volatile liquid/ brown vapour, orange solution
      • Iodine, shiny black solid sublimes to give purple vapour, Brown solution
    • Oxidising power of halogens
      • Oxidising agents accept electrons
      • decreases down group as F has strongest electronegativity
    • Test for halide ions
      • F
        • Cl
          • Br
            • I
              • Add AgNO3 yellow precipitate
                • Add dilute NH3 no change
            • Add AgNO3 cream precipitate formed
              • Add dilute NH3 no change
                • Add conc NH3 precipitate dissolves
          • Add AgNO3 white precipitate formed
            • Add dilute NH3 precipitate dissolves
        • Add AgNO3 no precipitate formed
    • Reducing power of halide ions
      • Reducing agent are species which accept electrons
        • Increases down group
          • I- has larges atomic radius so weakest electrostatic force of attraction between outer electrons and nucleus

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Chem 2 resources »