Alkali Metals- group 1

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  • Group 1- The Alkali Metals
    • The group 1 elements are called the alkali metals. They are all metal that react readily with air and water
    • They are soft solid at room temperature with low melting and boiling points that decrease going down the group. They have low densities, so lithium, sodium and potassium float on water.
    • They react with water to produce hydrogen gas and a metal hydroxide  that is an alkali, e.g
      • Sodium+water = soduimhrdroxide+ hydrogen
        • 2Na+2H20= 2NaOH+H2
    • They all have one electron in their outer shell. They lose this electron in reactions to form ionic compounds in which their ions have a single positive charge e.g. Na+.
    • They react with the halogen (group 7) to form salts that are white or colourless crystals,eg.
    • Compounds of alkali metals dissolve in water, forming solutions that are usually colourless
    • Going down group 1, the reactivity of the alkali metals increases
  • They all have one electron in their outer shell. They lose this electron in reactions to form ionic compounds in which their ions have a single positive charge e.g. Na+.
  • They react with the halogen (group 7) to form salts that are white or colourless crystals,eg.
  • sodium+chlorine =sodium chloride
    • 2Na+Cl2= 2NaCl

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