• Created by: xprinnyx
  • Created on: 27-02-19 21:02

G R O U P 7

  • The elements in group 7 are non-metals called the halogens.
  • Their halogens show trends in their physical and chemical properties.

p h y s i c a l  properties

  • CHLORINE,Cl2-pale green, gas
  • BROMINE,Br2-brown, liquid 
  • IODINE, I2-purple-black, solid
  • the melting points and boiling points of the halogens increase going down group 7.
  • the molecules become larger 
  • more energy is needed to overcome these forces 

c h e m i c a l properties

  • halogens have 7 electrons in their outer shell which means that they all have similar chemical properties
  • reaction with metals- they react with metals to produce salts eg. sodium + chlorine→ sodium chloride 
  • the halogens become less reactive going down the group.
  • a more reactive halogen can displace a less reactive halogen from solutions of its salts.                          eg. chlorine is more reactive than iodine. A solution of chlorine can displace iodine from a potassium iodine solution solution=chlorine+potassium iodide→potassium chloride + iodine 
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