Ions and Electrolytes.

• Ions are charged particles; if positively charged, called cation and if negatively charged, called anion.
• Ion may be atom or group of atoms which have lost or gained electron and thus acquired positive
  or negative charge respectively.
• Electrolytes are ionic substances that can conduct the electric current by transfer of ions (not electron), 
• e.g. Na⁺, K⁺, Cl^-, HCO₃^--