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 astatine and tenocine often ignored in the course?


  They don't really come up in the course
• What are diatomic molecules?

  Molecules made 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
• How does reactivity change among halogens as you go down the group?

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

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

  Halide
• What are the names of halides formed from halogens?

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

  Alkali metals
• What is a displacement reaction involving halogens?

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

  Chlorine displaces bromine to form potassium chloride
• What is the state of noble gases at room temperature?

  Colorless gases
• Why are noble gases considered inert?

  They have full outer shells
• How do noble gases exist in nature?

  As single atoms
• What is the flammability of noble gases?

  They are non-flammable
• How does the boiling point of noble gases change down the group?

  It increases
• What are the key differences between halogens and noble gases?

  Halogens:

  • Reactive
  • Exist as diatomic molecules
  • Form ionic and covalent bonds

  
  

  Noble Gases:

  • Inert
  • Exist as single atoms
  • Do not form bonds