Chemistry C3.1

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  • Chemistry C3.1
    • Group 1 - Alkali metals
      • The elements in group 1 are called Alkali metals
      • These metals all react with water to produce hydrogen & an alkaline solution containing the metal hydroxide
      • They form positive ions with a charge of 1+ in reactions to make ionic compounds
      • Their compounds are usually white or colourless crystals that dissolve in water producing colourless solutions
      • The reactivity of the alkali metals increases going down the group
    • Transition elements
      • Much higher melting points and densities than alkali metals
      • Harder & stronger than alkali metals but are much less reactive
      • Do not react vigorously with oxygen or water
      • Can form ions with different charges, in compounds that are often coloured
      • Important industrial catalysts
    • Group 7  Halogens
      • They all form ions with a single negative charge in their ionic compounds with metals
      • Form covalent compounds by sharing electrons with other non-metals
      • A more reactive halogen can displace a less reactive halogen from a solution of one of its salts
      • The reactivity of the halogens decreases going down the group


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