Lesson Plan: Halogens Science

This lesson plan includes the objectives and prerequisites of the lesson teaching students how to identify and name halogens, describe their physical properties, and explain their chemical activity.


Students will be able to

  • identify the location of the halogen group on the periodic table,
  • identify and name the elements in the halogen group,
  • describe the physical properties of halogens and how these change when descending the group,
  • write word and symbol equations for the reactions of halogens with metals to form salts,
  • describe how the reactivity of halogens decreases when descending the group,
  • state that all the elements of the halogen group contain seven electrons in their outer shell,
  • state that all the elements of the halogen group gain one electron to form negative ions with a 1 charge,
  • know that halogens usually exist as diatomic molecules,
  • know that elements of the halogen group are reactive and are often found in nature as compounds (except At),
  • describe how halogens can displace each other in a solution depending on their position in the group.


Students should already be familiar with

  • the periodic table,
  • ions.

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