Halogens

• What are the elements in Group 7 of the Periodic Table called?

  Halogens
• Why is it hard to see that halogens form a family of elements?

  Because they look so different from each other
• What is the significance of the number of electrons in the outer shell of halogens?

  It determines how the elements react
• What does the name "halogen" mean?

  Salt-producing
• What type of compounds do halogens produce when they react with metals?

  A wide range of salts
• What is the formula for the ion produced by halogens in salts?

  X⁻ (where X stands for any halogen atom)
• What type of molecules do halogens exist as?

  Diatomic molecules
• What are the physical states and colors of the halogens at room temperature?

  • F₂: gas, yellow
  • Cl₂: gas, green
  • Br₂: liquid, red-brown
  • I₂: solid, grey with purple vapour
• How do the melting and boiling points of halogens change down the group?

  They increase and the color becomes darker
• What is the physical state and color of iodine at room temperature?

  Solid, grey with purple vapour
• What is the physical state and color of bromine at room temperature?

  Liquid, red-brown
• What is the physical state and color of chlorine at room temperature?

  Gas, green
• What is the physical state and color of fluorine at room temperature?

  Gas, yellow
• What evidence do displacement reactions involving halogens and halides provide?

  They provide evidence for the trend in reactivity in Group 7
• What are the halogens in the Periodic Table?

  Fluorine, chlorine, bromine, iodine, and astatine
• What is the trend in physical properties of the halogens?

  Melting and boiling points increase and color becomes darker down the group