Halogens and noble gases

• What are the two groups of elements discussed in the video?

  Group seven elements known as halogens and 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, also an antiseptic
• What is the state of iodine at room temperature?

  Iodine is a dark gray solid
• Why are astatine and tenocine mentioned in the video?


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

  Diatomic molecules are molecules that consist of two atoms
• How do halogens form diatomic molecules?


  They do this by sharing electrons and forming a covalent bond
• What type of structures do halogen compounds form with other non-metals?

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

  The melting points and boiling points 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 as you go down the group?

  Because the outermost shell gets further from the nucleus, weakening the attractive force
• What do we call a halogen that gains an electron?

  We call it a halide
• What are the names of the halides formed from halogens?

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


  They most often form ionic compounds with alkali metals in group 1
• What is a displacement reaction involving halogens?

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

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

  • Exist as colorless gases
  • Have full outer shells, making them inert
  • Exist as single atoms
  • Non-flammable
  • Boiling point increases as you go down the group
• Why are noble gases considered inert?

  Because they have full outer shells and do not react with other atoms
• How does the boiling point of noble gases change as you go down the group?

  The boiling point increases as you go down the group
• What is the state of noble gases at room temperature?

  Noble gases exist as colorless gases
• What is the main takeaway from the video regarding noble gases?

  There isn't much that you need to know about them