A galvanic cell consists of a Cd(s)|Cd2+(aq) half-cell and a Zn(s)|Zn2+(aq) half-cell connected by a salt bridge.  Reduction occurs in the cadmium half-cell.  The cell can be represented in standard notation as

   

Cd(s)|Cd2+(aq) || Zn(s)|Zn2+(aq

   

Zn(s)|Zn2+(aq) || Cd(s)|Cd2+(aq

   

 (Zn(s)|Zn2+(aq) || Cd2+(aq)|Cd (s

   

Cd2+(aq)|Cd(s|| Zn(s)|Zn2+(aq