Group 2

• Explain why the first ionionization energy of the group 2 elements decreases down the group (2 marks)

  • The outer electron is in a higher energy level/there is an increase In shielding/the atom gets larger/more shells
  • There is a weaker attraction between a nucleus and the outer electron
• Explain Why the third ionisation energy of magnesium is much higher than the second ionisation energy of magnesium (2 marks)

  • The electron is removed from lower energy level
  • Electron being removed is less shielded