Group7

• What type of elements are in Group 7 of the periodic table?

  Non-metal elements
• What are the elements in Group 7 called?

  Halogens
• Where is Group 7 located on the periodic table?

  On the right side of the periodic table
• What trends do halogens show in their properties?

  • Trends in physical properties
  • Trends in chemical properties
• How do halogens exist in terms of molecular structure?

  As simple molecules
• What is the bond type between halogen atoms in a molecule?

  Single covalent bond
• What happens to relative molecular mass as you go down Group 7?

  It increases
• What are the physical states and colors of chlorine, bromine, and iodine at room temperature?

  • Chlorine: Pale green gas
  • Bromine: Brown liquid
  • Iodine: Purple-black solid
• How do melting and boiling points change in Group 7?

  They increase down the group
• Why do melting and boiling points increase down Group 7?

  Molecules become larger and intermolecular forces stronger
• How many electrons do group 7 elements have in their outer shell?

  Seven electrons
• What type of ions do halogens form when they react?

  Negatively charged ions
• What is the stable arrangement of electrons for halogen ions?

  A complete outer shell
• What do halogens produce when they react with metals?

  • Salts
  • Made up of ions
  • Held together by ionic bonds
• What is the balanced equation for sodium reacting with chlorine?

  2Na(s) + Cl2(g) → 2NaCl(s)
• What happens when sodium and chlorine react?

  They produce sodium chloride with an orange flame
• How does reactivity change in Group 7 elements?

  • Reactivity decreases down the group
• What are the reactions of halogens with iron wool?

  • Fluorine: Produces iron(III) fluoride
  • Chlorine: Produces iron(III) chloride
  • Bromine: Produces iron(III) bromide
  • Iodine: Produces iron(II) iodide
• What is produced when a halogen reacts with hydrogen?

  A hydrogen halide
• What is the balanced equation for chlorine reacting with hydrogen?

  H2(g) + Cl2(g) → 2HCl(g)
• What happens when hydrogen chloride dissolves in water?

  It produces hydrochloric acid
• What happens when halogens react with hydrogen?

  • Fluorine: Explodes forming hydrogen fluoride
  • Chlorine: Explodes forming hydrogen chloride
  • Bromine: Vigorous reaction forming hydrogen bromide
  • Iodine: Very slow reaction forming hydrogen iodide