group 7 elements

• as you go down the group, halogens become less reactive as its harder to gain an electron as the outer electron is further away
• going down the group, halogens have a higher boiling and melting point
• halogens can form simple molecular compounds by covalent bonding
• halogens can form ionic compounds with metals as they will gain an electron and have ionic structures
• a displacement reaction can occur between the more reactive halogen and the salt of the less reactive one