Group 7 & Group 0 (Halogens & Noble Gases)

• What are the group 7 elements called?

  Halogens
• Are halogens metals or non-metals?

  Non-metals
• What are the first 4 group 7 elements, starting at the top of the group?

  Fluorine. Chlorine. Bromine. Iodine
• What is the state and colour of chlorine at room temperature?

  Green gas
• What is the state and colour of fluorine at room temperature?

  Yellow gas
• What is the state and colour of bromine at room temperature?

  Red-brown liquid
• What is the state and colour of iodine at room temperature?

  Dark grey solid, giving off purple fumes
• What are the three trends in the group 7 elements as you go down the periodic table?

  Decreased reactivity, higher melting/boiling points, higher atomic mass
• Are halogens monatomic or diatomic?

  Diatomic molecules. This means they exist in pairs of atoms like F2, or Cl2
• Why do halogens become less reactive as you move down group 7 of the periodic table?

  As you go down the group, atomic radius and shielding increase (which outweighs the increased nuclear charge). This means there is a weaker electrostatic attraction between the nucleus and the electron it is trying to gain. This means more energy is required for a reaction to occur
• What type of bonds do halogens form with metals?

  Form ionic bonds with metals
• What is a halogen displacement reaction?

  A more reactive halogen displaces a less reactive one
• Could chlorine displace the bromine in potassium bromide?


  Yes, because chlorine is more reactive than bromine
• What are the group 0 elements called?

  Noble gases
• Are noble gases metals or non-metals?

  Non-metals
• Noble gases are ‘inert’, what does ‘inert’ mean?

  They’re not reactive, so they don’t react with other atoms
• Why are noble gases inert?

  They have already have a full outer-shell of electrons, so don’t need to gain or lose any electrons
• What is the physical state of group 0 elements at room temperature?

  Group 0 elements are noble gases, which are all gaseous at room temperature
• What is the trend in the boiling points of noble gases as you move down group 0 of the periodic table?


  Increases as you move down the group. This is because the atoms have more electrons, and so can form more intermolecular forces, which will require more energy to overcome
• Are noble gases monatomic or diatomic?


  Monoatomic, which means they exist as single atoms, not bonded to anything