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A voltaic cell is constructed in which the anode is a Ni|Ni^2+ half cell and the cathode is a Sn|Sn^2+ half cell. The half-cell compartments are connected by a salt bridge. (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq)) or (s). If a box is not needed, leave it blank.) In the external circuit, electrons migrate ____ the Ni|Ni^2+ electrode ____ the Sn|Sn^2+ electrode. In the salt bridge, anions migrate ____ the Sn|Sn^2+ compartment ____ the Ni|Ni^2+ compartment.