Group 7

Group 7

1. Van der Waals increase down group due to increase in electrons

   • Boiling points increase.

2. Reactivity decreases down the group

   • Atomic radius increases
   • Shielding increases
   • Nuclear attraction for other electrons is not as strong

3. Need to attract an electron to form octet!!! - ion

4. Halide ions

   • Chlorine + silver = white precipitate
     • Soluble in dilute ammonia
   • Bromine + silver = cream precipitate
     • Soluble in concentrated ammonia
   • Iodine + silver = yellow precipitate
     • Insoluble in concentrated ammonia