Final answer:
Nickel (II) will have a greater number of ions than copper (I) when comparing equal moles of each because nickel (II) produces two ions per molecule due to its 2+ charge, whereas copper (I) produces one ion per molecule with its 1+ charge.
Step-by-step explanation:
The question is asking which will have the greater number of ions, 1 mole of nickel (II) or 1 mole of copper (I) ions.
The nickel (II) ion, with a 2+ charge, will produce two moles of ions for every mole of nickel (II) salts dissociated in solution.
In contrast, the copper(I) ion (also known as cuprous ion), with a 1+ charge, will yield only one mole of ions per mole of copper (I) salts dissociated.
Since both are measured in 1 mole, nickel (II) will produce twice the number of ions compared to copper (I).