group 0 (noble gases)

• What are the elements in Group 0 of the Periodic Table called?

  Noble gases
• What are the characteristics of noble gases?

  • Non-metals
  • Monatomic (exist as single atoms)
  • Colourless and non-flammable gases at room temperature
• Why do most elements participate in reactions?

  To complete their outer shells of electrons
• Why do Group 0 elements not participate in reactions?

  They have full outer shells of electrons
• What does being chemically inert mean for noble gases?

  They are unreactive and do not form molecules easily
• How are noble gases useful in applications?

  • Provide an inert atmosphere for welding
  • Fill light bulbs
• What trends exist in the physical properties of noble gases?

  They have very low melting and boiling points
• What happens to melting and boiling points as you go down the noble gases group?

  They increase as atomic size increases
• Why do melting and boiling points increase down the group?

  Atoms get larger and relative atomic mass increases
• What leads to an increase in intermolecular forces between noble gas atoms?

  Increase in atomic size and mass
• What is the boiling point of helium?

  -269 ºC
• What is the boiling point of radon?

  Around -60 ºC
• What is the significance of noble gases having boiling points below 0 ºC?

  They remain gaseous at room temperature