formation of ions

• what do atoms need in order to be stable?


  a full outer shell of electrons
• what do atoms that gain electrons become?


  ions with a negative charge
• what do atoms that lose electrons become?


  ions with a positive charge
• which groups form ions very easily?


  • 1
  • 2
  • 6
  • 7
• why do certain groups form ions easily?


  • this is because they only need to gain or lose a small number of electrons
  • and so less energy is required
• why do certain groups not form ions very easily?

  which groups are they?

  • they need to gain or lose a larger number of electrons and therefore more energy is required
  • 3
  • 4
  • 5