Halogens and Noble Gasses

• Group seven elements (halogens)

  • Fluorine
  • Chlorine
  • Bromine
  • Iodine
  • Astatine
  • Tennessine
• Fluorine


  • Poisonous yellow gas, very reactive
• Chlorine


  • Less reactive, poisonous green gas
• Bromine


  • Ready brown volatile liquid, poisonous
• Iodine


  • Dark gray solid, can form poisonous purple vapors, also an antiseptic
• Astatine and Tennessine can be ignored as they don't really come up in the course
• Diatomic molecules


  Two atom molecules formed by halogens sharing electrons and forming covalent bonds
• Simple molecular structures


  Compounds formed by halogens forming covalent bonds with other non-metals such as hydrogen or carbon
• As you go down the halogen group

  Melting and boiling points increase, reactivity decreases
• Halides


  Ions formed when a halogen gains an electron, named as fluoride, chloride, bromide, iodide
• More reactive halogens


  Displace less reactive halogens in displacement reactions
• Noble gases


  • Colorless gases, inert, non-flammable, exist as single atoms
• As you go down the noble gas group


  Boiling points increase