Chemistry - Group 2

• Atomic radius

  • increases
  • due to additional electron shells
• Reactivity

  • increases
  • electron shielding increases
  • easier to lose an electron
• First ionisation energy

  • decreases
  • due to greater atomic radii
  • increased amounts of shielding
• Melting point

  • decreases
  • attractive forces have to act over a greater distance
• Reactions with water

  • redox reactions
  • metal hydroxide and hydrogen
• Magnesium + steam

  • Bright white flame
  • Magnesium oxide (a white powder)
• Solubility of hydroxides

  • increases
• Solubility of sulfates

  • decreases
• Electronegativity

  • decreases
• Uses of magnesium hydroxide

  • antacids
  • laxatives
• Uses for calcium hydroxide

  • sewage treatment
  • paper production
  • food processing
• Uses for barium sulfate

  • oil welling drilling treatments
  • plastic filler
  • pH tester on soil
• Calcium oxide and Calcium Carbonate

  • removal of sulfur dioxide (flue gas)
  • limestone
• Explain why the third ionisation energy of magnesium is much higher than the second ionisation energy of magnesium

  • electron is removed from the 2p subshell
  • the subshell is closer to the nucleus
  • so the electron that was removed has less sheilding