Group 7

• Fluorine at room temp

  Yellow gas
• Chlorine at room temp

  Green gas
• Bromine at room temp

  Red-brown liquid
• Iodine at room temp

  Dark grey solid that gives of purple flames
• Trends in group 7 elements as you go down the periodic table

  Decreased reactivity

  Higher melting/boiling points

  Higher atomic mass
• Are halogens monoatomic or diatomic

  Diatomic because they exist in pairs of atoms
• Why does the reactivity decrease as you go down

  Atomic radius and shielding increase

  Weaker electrostatic attraction between nucleus and electron it is trying to gain

  More energy is required for a reaction to occur
• Halogens form ionic bonds with metals
• Halogen displacement reaction

  Reaction which is a more reactive halogen displaces a less reactive one