Group 7 - Halogens

• What are the symbols for the halogens mentioned?

  F, Cl, Br, I, At
• How does the size of F compare to Cl?

  F is smaller than Cl
• Why is the electron added to F attracted more than to Cl?

  It is closer to the protons in the nucleus
• What happens to the boiling and melting points as you go down the halogens?

  They increase
• Which boiling points are higher than melting points in Group 7 elements?

  Boiling points
• What happens to the size of atoms as you go down the group?

  The atoms get bigger
• What happens to the forces between molecules as you go down the group?

  The forces increase
• What is the relationship between atomic size and boiling/melting points in Group 7 elements?

  • Atoms get bigger down the group
  • Increased atomic size leads to stronger forces
  • Stronger forces result in higher boiling/melting points
• What are some physical properties of Group 7 elements?

  • Very reactive
  • Volatile
  • Non-metals
  • Low melting/boiling points
  • Toxic
  • Brittle
  • Diatomic molecules
  • Cannot conduct electricity
• What happens to Group 7 atoms when they react with metals?

  Electrons are transferred
• What type of ions do Group 7 atoms become when they gain an electron?

  Negative ions
• What type of compound is formed when Group 7 halogens react with metals?

  Ionic compound
• What happens to Group 7 atoms when they react with non-metals?

  Electrons are shared
• What type of compound is formed when Group 7 halogens react with non-metals?

  Simple molecular compound
• What are the differences in electron behavior when Group 7 elements react with metals versus non-metals?

  • With metals:
  • Electrons are transferred
  • Form negative ions
  • Result in ionic compounds
  • With non-metals:
  • Electrons are shared
  • Result in simple molecular compounds
• What color is fluorine gas?

  Yellow
• What color is chlorine gas?

  Yellow/green
• What color is bromine in liquid form?

  Orange/red/brown
• What color is iodine in solid form?

  Purple/black
• What are the physical states and colors of the halogens mentioned?

  • Fluorine: gas, yellow
  • Chlorine: gas, yellow/green
  • Bromine: liquid, orange/red/brown
  • Iodine: solid, purple/black