Group 7 & Group 0 (Halogens & Noble Gases)

• 1. Fluorine is a poisonous yellow coloured gas and is the most reactive halogen
  2. Chlorine is a green coloured gas.
  3. Bromine is a red-brown volatile liquid which is also poisonous. 
  4. Iodine is a grey coloured solid with purple vapours. 
• properties are seen in group 7 elements:

  • They can form covalent bonds with other non-metals
  • Their ions usually have a 1- charge
• Do the melting and boiling points of the halogens increase or decrease as you go down the group?

  • increase
• The halogens exist as diatomic molecules, meaning each molecule consists of two atoms.

  The two atoms are joined by a covalent bond, which allows each atom to share an electron, giving each atom a full outer shell.

  
• noble gases are not flammable
• Why are the noble gases inert?

  • they have full outer electron shells