Ge note: both Si and Ge are metalloids. However, one Ge can form +2 ions. Si can only form +4 ions. Down a group, the low oxidation state become more popular. Pb in +2 oxidation state is very stable. Solution Ge note: both Si and Ge are metalloids. However, one Ge can form +2 ions. Si can only form +4 ions. Down a group, the low oxidation state become more popular. Pb in +2 oxidation state is very stable..