# Which will have the greater number of ions, 1 mol of nickel (II) or 1 mol of copper (I)?

You have the same number of metal ions for each example: $\text{Avogadro's number}$, which is?????
But it depends on how they worded the question. Cations or anions do not occur in isolation. $1$ $m o l$ of $N i C {l}_{2}$ formally contains $3$ $m o l$ of ions: $2 \times C {l}^{-}$; and $1 \times N {i}^{2 +}$.
AS the question currently stands, however, there are ${N}_{A}$ metal ions of $C u \left(I\right)$ and $N i \left(I I\right)$. Which has the most mass?