Halogens and Noble Gases

• What are the group seven elements known as?

  Halogens
• What are the group zero elements known as?

  Noble gases
• What are the properties of halogens?

  • Fluorine: poisonous yellow gas, very reactive
  • Chlorine: poisonous green gas, less reactive
  • Bromine: reddish-brown volatile liquid, poisonous
  • Iodine: dark gray solid, forms poisonous purple vapors, antiseptic
• What is the state of fluorine at room temperature?

  Poisonous yellow gas
• What is the state of chlorine at room temperature?

  Poisonous green gas
• What is the state of bromine at room temperature?

  Reddish-brown volatile liquid
• What is the state of iodine at room temperature?

  Dark gray solid
• Why are halogens considered dangerous?

  They are all poisonous in various forms
• What are diatomic molecules?

  Molecules consisting of two atoms
• How do halogens form diatomic molecules?

  By sharing electrons and forming covalent bonds
• What type of compounds do halogens form with non-metals?

  Simple molecular structures
• What happens to the melting and boiling points of halogens as you go down the group?

  They increase as you go down the group
• How does reactivity change among halogens as you go down the group?

  Reactivity decreases as you go down the group
• Why does reactivity decrease in halogens down the group?

  Outermost shell is further from nucleus
• What do we call a halogen that gains an electron?

  Halide
• What are the names of halide ions?

  Fluoride, chloride, bromide, iodide
• With which group do halogens most often form ionic compounds?

  Alkali metals in group 1
• What is a displacement reaction in halogens?

  A more reactive halogen displaces a less reactive one
• What happens when chlorine gas is added to potassium bromide solution?

  Chlorine displaces bromine to form potassium chloride
• What are the characteristics of noble gases?

  Colorless gases, inert, non-flammable
• Why do noble gases exist as single atoms?

  They have full outer shells and are inert
• How does the boiling point of noble gases change down the group?

  It increases as you go down the group
• What are the trends in properties for halogens and noble gases?

  Halogens:

  • Melting and boiling points increase down the group
  • Reactivity decreases down the group

  
  

  Noble Gases:

  • Boiling points increase down the group
  • Inert and non-flammable