Group 7 halogens

• Describe the trend in melting and boiling points and densities of halogens down the group?

  Their melting, boiling and density increases
• Describe how the colour of halogens going down the group (at room temp)?

  it gets darker (F= pale yellow, Cl= plae green, Br = orange, I= grey)
• Describe why the melting and boiling points and densities increase going down the group?

  As the atoms/molecules become bigger, there are more intermolecular forces of attraction between particles holding them together so more energy is needed to break these forces.
• What is the word equation fir the reaction of lithium and flourine?

  Lithium + flourine = litium flouride
• what ions do halogens form when they react ?

  -1 ions they gain 1 electron to form a full outer shell so they gain a negative charge