Group 7 elements

• What are group 7 metals known as?


  Halogens.
• What is fluorine?


  A reactive, poisonous yellow gas.
• What is chlorine?


  A fairly reactive, poisonous dense green gas.
• What is bromine?


  A dense, poisonous, red-brown volatile liquid.
• What is iodine?


  A dark grey crystalline solid or a purple vapour?
• What happens to reactivity as you go down group 7?


  Decreases.
• Melting and boiling points both increase as you go down the group, as well as relative atomic mass.
• How many electrons do halogens have in their outer shell?


  7
• How can halogens form a full outer shell?


  Sharing an electron with another non metal through covalent bonding.
• What ions form when halogens bond with metals?


  Halide ions.
• A displacement reaction can occur between a more reactive halogen and the salt of a less reactive one.
• What would chlorine displace?


  Bromine and iodine.