GCSE Chemistry (AQA)

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Group 7: Compounds

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Atomic structure and the periodic table The periodic table

Group 7: Compounds

2:55 Group 7 Element Properties, Compounds, and Reactions
Spec 4.1.2.6
Previous Group 7: Halogens Next Halogen Displacement Reactions
  • Halogens form negative ions before forming compounds.
  • Examples of halogen ions include chloride, bromide, and iodide ions.
  • Halogens receive an electron to fill their outer shell, becoming negatively charged.
  • Halogen names end in "een" (e.g., chlorine, bromine, iodine), but as ions, they end in "ide" (e.g., chloride, bromide, iodide).
  • This naming convention is important for the compounds halogens form.
  • Halogens react with alkaline metals to form salts.
  • Example: Sodium reacts with chlorine to form sodium chloride (NaCl), a white solid salt.
  • Salt names combine the metal name with the halogen ion name, using the "ide" ending.
  • Sodium chloride is common table salt, but "salt" in chemistry refers to any alkali metal halogen compound.
  • Halogens also form compounds with non-metals, such as hydrogen.
  • Example: Hydrogen gas reacts with chlorine gas to form hydrogen chloride (HCl), a colorless gas.
  • Naming follows the same rules, using the "ide" ending.
  • For exams, predict and name products when halogens react with metals and non-metals, especially chlorine, bromine, or iodine.

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