Group 7 and Group 2 elements and ions.

Group 7 and Group 2 elements and ions.

1. Group 7- The halogens

   • The elements
     • Fluorine
       • Highest electronegativity.
       • Most reactive
     • Chlorine
       • Reacts with sodium hydroxide to make bleach
       • Reacts with water to make HCl and HClO
       • Takes part in disproportionation
     • Bromine
     • Iodine
   • Halide ion
     • With Sulfuric Acid
       • NaCl + NaF
         • HF or HCl is made.
         • Not a redox reaction.
       • NaBr
         • Makes bromine, Sulphur dioxide and 2 waters.
         • A redox reaction
       • NaI
         • Goes to Iodine, Hydrogen sulfide, Water
         • most powerfull reducing agent.
     • With sliver nitrate.
       • NaF = No ppt.
       • NaCl= white ppt.
       • NaBr= Cream ppt.
       • NaI = yellow ppt.
     • -1
   • Boiling points increase.

2. Group 2- The ALKALINE EARTH METALS.

   • Trends
     • Atomic radius
       • Increases down the group
     • Ionisation energy
       • Decreases down the group.