Answer
$Ni,Sn,Zn,Cr,Fe,Mn,Al,Li,Na,K,Ca,Mg$ are metals that would all work.
Work Step by Step
To make $Pb^{2+}$ ions become solid, the lead metal must be oxidized so it loses its electrons and can become solid lead metal. To accomplish this, we can choose the elements above $Pb$ in the activity series. Therefore any of the metals listed below will work: $Ni,Sn,Zn,Cr,Fe,Mn,Al,Li,Na,K,Ca,Mg$
