Periodic Table

• Elements in any group of the periodic table have similar chemical properties
• Alkali Metals

  • Very Reactive
  • Soft
  • Stored under oil
  • Reacts with water to form an alkali solution
  • Reacts with oxygen to for metal oxide
• Transition Metals

  • Hard and dense
  • Less reactive than the alkali metals
  • Used in catalysts
  • Formed coloured compounds
• Haloges

  • Diatomic elements (two atoms)
  • All toxic
  • Fluorine added to toothpaste to prevent decay
  • Chlorine used to sterilise swimming pools
  • Iodine used to treat wounds
• Nobel Gasses

  • Least reactive of all the elements
  • Do not react at all