Structure of ionic compounds

• Shell 1


  Max 2 electrons
• Shell 2


  Max 8 electron
• Ion


  An atom gains or loses electrons
• Atoms take part in chemical reactions to achieve a full outer shell of electrons and become stable
• Types of atoms


  • Metals
  • Non-metals
• Metal atoms


  Lose electrons to leave a full outer shell of electrons
• Non-metal atoms


  Gain electrons to fill their outer shell
• Cation


  Positively charged ion formed when a metal atom loses electrons
• Anion


  Negatively charged ion formed when a non-metal atom gains electrons
• Atoms become charged ions to achieve a full outer shell of electrons
• How many electrons in shell 3

  8
• How many electrons in shell 4

  2