The balanced equation is
The reaction can be called a single displacement reaction.
Copper is above silver in the activity series of metals.
Thus, copper will displace silver from its salts.
The silver deposits as a finely-divided gray-black solid "mold" on the copper, and the greenish colour is caused by the aqueous solution of copper(II) nitrate.
The reaction is also a reduction-oxidation reaction.
The copper reduces the
The net ionic equation is