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The Periodic Table, Bibliography, Reactions, Physical Reactions, image,…

- - - - They’re the first group of the periodic table.
      - Lithium, sodium, potassium, caesium and francium.
    - - Reactions with lithium sodium and potassium.
      - Reaction with water:
        
        Lithium floats and freezes.
        
        Sodium shoots across the water.
        
        potassium melts with the heat of the reaction.
      - Reaction with Chlorine
        
        The 3 will burst into flame.
      - Reaction with oxygen
        
        The 3 will burst into flame.
    - - Good conductors of energy and heat.
      - They are very softer and lighter than other metals.
      - They have low melting and boiling points.
      - As you down the table the properties increase or decrease.
    - - They react similarly because they have the same number of valencies.
      - They are the most reactive of all.
      - They are the most reactive so they can lose one electron, to have a stable outer shell.
  - - - Non metal elements. (fluorine, chlorine, bromine and iodine.)
      - They form colored gases for example, chlorine is a green gas.
      - They are poisonous.
      - Contain two atoms.
    - - They are among the most reactive elements in the periodic table.
      - React with metals to form halides (compounds).
      - Example: When fluorine reacts with iron wool, the iron bursts into flame as flourine passes over it. As this happens the reactivity decreases.
  - - - Helium: Used to fill balloons and airships (lighter than air and won't catch fire)
      - Argon: Provide inert atmosphere
        
        Filler in tungsten light bulbs.
        
        Protect metals that are being welded
    - - Non-metal elements (helium, neon, argon, krypton and xenon).
      - Colorless
      - Monatomic
      - Unreactive (safe to use)
    - - Boiling point increases due to the attraction of atoms.
      - The gases grow denser down the group because the mass of the atoms increases.