Group 0 Nobel gases

• why are the group 0 elements known as 'noble gases'?

  they are chemically inert, they are rarely reactive with other elements as they already have a full outer shell so are chemically stable
• Explain one reason why xenon is used in camera flashes.

  It releases a bright white light when electricity is passed through it
• Describe the trend in melting, boiling points, and densities of group 0 going down the group

  They all increase down the group
• Explain the trend in the melting points, boiling points, and densities of group 0 elements going down the group

  The atoms are larger meaning more intermolecular forces of attraction between the atoms and this requires more energy to break
• Explain why it is very rare for noble gases to form ions.

  They don't lose or gain electrons this is because they already have a full outer shell and are chemically stable.